But every time there is a mainstream movie or book or video game with a non-white, non-male, non-cis, or non-straight character, it's review-bombed and attacked as being "political".
If people are upset about a character's race, sexuality, or gender identity being represented, then they deserve to be preached to.
I am unaware that Brooklyn-99 for example got review bombed despite one of the main characters, or at least important side character, being a gay african american. Because in my opinion B99 does inclusion right. Its not hidden, but (apart from a few episodes in later seasons) him being gay is not the defining trait of this character. Its just something he is and no special attention is paid to it.
That is in stark contrast to another character in the same show who later came out (was made?) Bi and over the next few episodes everyone couldn't stop talking about how this character is Bi and how ok and normal that is. Nothing about that felt natural.
Another type of forced inclusion, to come back to RPGs is when by lore there is no reason for this person to exist, or at least be very uncommon.
This is seen for example by the recent additions of disabled people in wheelchairs to Pathfinder and Starfinder.
The problem is that in Starfinder there are a lot of ways to overcome being disabled. Cybernetics are very cheap and magical healing also exist. In fact its cheaper to get organs regenerated or replaced than it is to buy a mid level wheelchair. So in the lore of the setting a person in a wheelchair, especially a affluent one, would be very strange as they voluntarily choose to be disabled.
But that is something you are not allowed to question as this person is there for representation purposes and thus "transcents" the internal logic of the setting.
So when people say they do not want politics in their show/games, they do not want this type of "this person has to be in to show inclusion even though it does not make sense for the setting at all". Many (of course not all) complains about the recent LotR and not so recent wheel of time series fall into this category, but got all lumped together into a "everyone who complains is racist" defence.