Relevant sections of the Arch wiki: XDG Base Directory - ArchWiki (search for .gtkrc-2.0 only returns gtk2, which I have deleted)
Report everything you have already attempted to solve your problem.
Adding export GTK2_RC_FILES="$XDG_CONFIG_HOME"/gtk-2.0/gtkrc to my bash and fish configs, similar lines to /etc/environment and /etc/security/pam_env.conf, uninstalling gtk2 and webkitgtk2, edit /usr/lib/libFcitx5Core.so to replace '.gktrc-2.0' string literal with '.var/shit' (I thought I'd try lol, only result of grepping in /lib), delete /etc/skel/.gtkrc-2.0
Logging in from a tty and startx didn't create the file. I'm wondering if it is sddm, but I see nothing to indicate that would be the case.
inxi -Faz
System: Kernel: 5.15.5-zen1-1-zen x86_64 bits: 64 compiler: gcc v: 11.1.0
parameters: BOOT_IMAGE=/@/boot/vmlinuz-linux-zen root=UUID=74b4d5d6-793e-49c5-b882-ea7d9611ad1c rw
rootflags=subvol=@ quiet splash rd.udev.log_priority=3 vt.global_cursor_default=0
systemd.unified_cgroup_hierarchy=1 loglevel=3
Desktop: KDE Plasma 5.23.3 tk: Qt 5.15.2 info: latte-dock wm: kwin_wayland vt: 2 dm: SDDM Distro: Garuda Linux
base: Arch Linux
Machine: Type: Convertible System: LENOVO product: 81Q9 v: Yoga C940-14IIL serial: <superuser required> Chassis: type: 31
v: Yoga C940-14IIL serial: <superuser required>
Mobo: LENOVO model: LNVNB161216 v: SDK0K17763 WIN serial: <superuser required> UEFI: LENOVO v: AUCN57WW
date: 08/18/2020
Battery: ID-1: BAT1 charge: 16.1 Wh (30.4%) condition: 52.9/60.0 Wh (88.1%) volts: 7.5 min: 7.7 model: Celxpert BASE-BAT
type: Li-poly serial: <filter> status: Discharging
CPU: Info: Quad Core model: Intel Core i7-1065G7 bits: 64 type: MT MCP arch: Ice Lake family: 6 model-id: 7E (126)
stepping: 5 microcode: A6 cache: L1: 320 KiB L2: 2 MiB L3: 8 MiB
flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 23961
Speed: 1128 MHz min/max: 400/3900 MHz Core speeds (MHz): 1: 1052 2: 1157 3: 1111 4: 1101 5: 1137 6: 1100 7: 1100
8: 1101
Vulnerabilities: Type: itlb_multihit status: KVM: VMX disabled
Type: l1tf status: Not affected
Type: mds status: Not affected
Type: meltdown status: Not affected
Type: spec_store_bypass mitigation: Speculative Store Bypass disabled via prctl
Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer sanitization
Type: spectre_v2 mitigation: Enhanced IBRS, IBPB: conditional, RSB filling
Type: srbds status: Not affected
Type: tsx_async_abort status: Not affected
Graphics: Device-1: Intel Iris Plus Graphics G7 vendor: Lenovo driver: i915 v: kernel bus-ID: 00:02.0 chip-ID: 8086:8a52
class-ID: 0300
Device-2: IMC Networks Integrated Camera type: USB driver: uvcvideo bus-ID: 3-1:2 chip-ID: 13d3:56b2 class-ID: 0e02
Display: wayland server: X.Org 1.21.1.3 compositor: kwin_wayland driver: loaded: intel display-ID: :1 screens: 1
Screen-1: 0 s-res: 1920x1080 s-dpi: 96 s-size: 508x285mm (20.0x11.2") s-diag: 582mm (22.9")
Monitor-1: XWAYLAND0 res: 1920x1080 hz: 60 dpi: 157 size: 310x170mm (12.2x6.7") diag: 354mm (13.9")
OpenGL: renderer: Mesa Intel Iris Plus Graphics (ICL GT2) v: 4.6 Mesa 21.2.5 direct render: Yes
Audio: Device-1: Intel Ice Lake-LP Smart Sound Audio vendor: Lenovo driver: sof-audio-pci-intel-icl
alternate: snd_hda_intel,snd_sof_pci_intel_icl bus-ID: 00:1f.3 chip-ID: 8086:34c8 class-ID: 0401
Sound Server-1: ALSA v: k5.15.5-zen1-1-zen running: yes
Sound Server-2: JACK v: 1.9.19 running: no
Sound Server-3: PulseAudio v: 15.0 running: no
Sound Server-4: PipeWire v: 0.3.40 running: yes
Network: Device-1: Intel Ice Lake-LP PCH CNVi WiFi driver: iwlwifi v: kernel bus-ID: 00:14.3 chip-ID: 8086:34f0
class-ID: 0280
IF: wlp0s20f3 state: up mac: <filter>
IF-ID-1: anbox0 state: down mac: <filter>
Bluetooth: Device-1: Intel AX201 Bluetooth type: USB driver: btusb v: 0.8 bus-ID: 3-10:4 chip-ID: 8087:0026 class-ID: e001
Report: bt-adapter ID: hci0 rfk-id: 3 state: up address: <filter>
Drives: Local Storage: total: 476.94 GiB used: 27.73 GiB (5.8%)
SMART Message: Unable to run smartctl. Root privileges required.
ID-1: /dev/nvme0n1 maj-min: 259:0 vendor: Samsung model: MZVLB512HBJQ-000L2 size: 476.94 GiB block-size:
physical: 512 B logical: 512 B speed: 31.6 Gb/s lanes: 4 type: SSD serial: <filter> rev: 3L1QEXF7 temp: 35.9 C
scheme: GPT
Partition: ID-1: / raw-size: 379.01 GiB size: 379.01 GiB (100.00%) used: 27.7 GiB (7.3%) fs: btrfs dev: /dev/nvme0n1p4
maj-min: 259:4
ID-2: /boot/efi raw-size: 260 MiB size: 256 MiB (98.46%) used: 29.1 MiB (11.3%) fs: vfat dev: /dev/nvme0n1p1
maj-min: 259:1
ID-3: /home raw-size: 379.01 GiB size: 379.01 GiB (100.00%) used: 27.7 GiB (7.3%) fs: btrfs dev: /dev/nvme0n1p4
maj-min: 259:4
ID-4: /var/log raw-size: 379.01 GiB size: 379.01 GiB (100.00%) used: 27.7 GiB (7.3%) fs: btrfs dev: /dev/nvme0n1p4
maj-min: 259:4
ID-5: /var/tmp raw-size: 379.01 GiB size: 379.01 GiB (100.00%) used: 27.7 GiB (7.3%) fs: btrfs dev: /dev/nvme0n1p4
maj-min: 259:4
Swap: Kernel: swappiness: 133 (default 60) cache-pressure: 100 (default)
ID-1: swap-1 type: zram size: 11.25 GiB used: 0 KiB (0.0%) priority: 100 dev: /dev/zram0
Sensors: System Temperatures: cpu: 49.0 C mobo: N/A
Fan Speeds (RPM): N/A
Info: Processes: 290 Uptime: 23m wakeups: 1062 Memory: 11.26 GiB used: 4.11 GiB (36.5%) Init: systemd v: 249
tool: systemctl Compilers: gcc: 11.1.0 clang: 13.0.0 Packages: 1632 pacman: 1624 lib: 372 flatpak: 8 Shell: fish
v: 3.3.1 default: Bash v: 5.1.12 running-in: konsole inxi: 3.3.09