Seriously. Every form of entertainment has baked-in political assumptions, and that definitely includes #ttrpg . You might choose not to examine them, but this is an active choice on your part, and you don’t get to pretend that your entertainment is “free of politics”.
People do not all have the same working definition of “politics”. Many people seem to use it to mean “overt content about contemporary issues”, but that’s not really a good definition.
If your game has sentient creatures with agency and desires, it has politics.
For example, if your game has a king, there’s politics. Having the people accept monarchy is a political statement. It’s not as hot-button as, say, having slavery, but it’s still political.
You might not be surprised if your players react to a world with chattel slavery by trying to free the slaves and end that institution. The same mechanism may lead them to want to end absolute monarchy. They see something in the setting they perceive as unjust, and want to change it.
A lot of people are kind of… uncritical, about many things. They don’t see absolute monarchy as “political” because it’s a familiar story trope. They are happy to accept this uncritically so they can get to the fun part where you get a quest to slay the dragon. (Note that the target of killing the dragon rather than, say, negotiating or rehoming it is also political)
People then get frustrated because they feel stupid, and they’re being blocked from pursuing the content they want. They just want to, for example, do a tactical mini game about fighting a big monster that spits fire. They don’t want to talk about the merits of absolute monarchy or slaying sentient creatures.
It’s okay to not always want to engage in the political dimension. That doesn’t mean it’s not there. If someone responds to the king giving you a quest with “wait, this is an absolute monarchy where the first born son becomes king? That’s fucked up” they’re not “making it political”. It already was political.
If you present a man and a woman as monogamously married in your game, that’s political. That’s a statement. If you show a big queer polycule, that’s also a statement. The latter will ping the aforementioned uncritical players as “political”, because it’s more atypical, but both are “political”.
Some of this can be handled in session 0. But sometimes you learn that some people in the group have different tastes and probably shouldn’t play together.