Maybe it starts when some people start to apply some power on other people ? But all your examples are people talking about themselves : their own lives, their own choices, their own specifics, their own struggles. I would say people can have all this and mention it as long as it stays on the fringe and does not become a topic to debate. This would be outside the scope of the group.
Maybe other people should avoid commenting on peoples life / choices / specifics / struggles, and the atmosphere may stay nice.
Here’s the thing though: Helen is presenting herself to be called Helen. That’s inherently asking other people to call her Helen and imposing on people to allow a person they see as male to enter a female bathroom! For people who see being transgender as a political issue, being asked to call a trans person by their name is bringing politics into it because theyre being imposed on to recognize a trans woman as female for bathroom purposes.
Thats what I mean when i think “no politics” gets weirdly messy. Like to me it’s not political to let Helen use the female bathroom, but that’s not a given. I’ve also seen situations like, is it political if David brings his boyfriend to the DnD group and they role play a gay couple? What about if Emily, an IRL conservative, says she’s not being political when her lawful good paladin tries to break up the gay couple in the game, because being gay is evil in her DnD religion?