Genuine question: The Office is generally(and caf's favourite) regarded as one of funniest shows of all time, and yet no one likes this because it might offend trans people?
Tldr; racism jokes, sexual harrasment, fat people jokes, mobbing - these are all fine when they are actually funny, but jokes about trans people- NOT FUNNY MATE!
I'm sure some people get bothered by those other topics you mention as well. Jimmy Carr was being criticised for jokes about gypsies just recently for example. Plenty of people complain about plenty of things.
The trans material just gets more attention at the moment because it has become a particularly popular topic for would-be edgy comedians in recent years, from big selling acts like Chappelle, Gervais and Louis CK down to no-talent schlubs at open mic nights. The amount of times I've heard variations of the same "if they can identify as X then I can identify as [insert silly comparison]" riff over the last half decade or so.....
And while I'm sure that makes trans people feel like they're a particular butt of jokes at the moment, from a non-trans POV the main issue is that it then increasingly comes across as tired, lazy, played out and unfunny material. Which if you read through this thread is gist of the complaints people actually have about Gervais, not that he's too offensive.
And if I'm thinking all this is old hat as a mid-thirties millenial then for younger people who have grown up more accepting of trans people it must seem even more increasingly like terribly middle-aged man comedy.
Though tbf that still makes it more current than his constant regurgitating of atheism material as if it's an edgy topic. It's 16 years since The God Delusion came out and millitant atheism was surging in popularity as a topic for comedians like Gervais. The fact that he's still doing the exact same schtick now again makes him seem rather tired and dated.
You can add riffs about "cancel culture" to the pile too. Again the issue isn't that their takes are wrong, it's that every fecking one of them seems to feel the need to dedicate a big chunk of their specials to talking about it. It's gotten stale. I'm bored of hearing millionaire comedians talk about how they're being silenced as part of their mega-popular, widely seen and extremely lucrative shows.