Your tone is totally inappropriate for a support forum. All you have to do is describe the problem and explain what you have tried so far to fix it. There is no need for a multi-paragraph whinge with insults and bad language.
You also did not follow the issue template.
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They only changed the DE of the live environment. As always, the user selects the DE they want in the installer. This decision has basically no impact on users whatsoever.
From what I understand, it made a few things easier for the developers. Whatever “consequences” they are “paying” are probably very much desired ones. 
Anyway, I believe the solution to your issue is here, in what is one of the first results in a pretty lazy web search (see the last post in the thread): Beep emitted by computer when I click on "log out" / Desktop / Xfce Forums
The same solution from your former distro EndeavourOS: Is there any way to disable the *BEEP* noise from xfce? - Newbie - EndeavourOS
The same solution again from your former distro Manjaro: Manjaro XFCE disable system beep - Xfce - Manjaro Linux Forum
The same solution again from your former distro Arch Linux (including a few additional variations): (SOLVED) System Beep / Newbie Corner / Arch Linux Forums
It’s a layer eight problem. 
If decide to post again in the future, please follow the template, be nice, and chill out on the language.