Trannies feel the need to place their politics everywhere because that's their one and only personality trait. Being Trans is political. It's why they always say "Trans Rights, Trans Rights" to each other without defining what those rights actually are. When they post the flag, it's to signal to other members of the "In group" that they're an ally/friend.

So the bumper sticker on Claire's truck in 2077,

the graffiti in A Hat in Time,

And now this,

Is it any wonder why people have a Pavlovian instinct to reject them when they see these colors/flag? This is a dog whistle, essentially. People sympathetic to this cause put it in as an empty virtue signal but it's really Aposematism to anyone not sympathetic. "This creation has been subverted by ideologically aligned people and buying it or playing it is at least acknowledging trans ideology, which is what they really want, so stay away." Is what it's saying when the "out group" looks at these colors.

The sad thing is trannies will never understand that if they don't force their ideology they might be accepted. The way they're doing it now is like using a crowbar in dentistry.
And all of this isn't talking about legitimate reasons to dislike trannies, namely being the pedastry that's practiced in the community.