Eh I guess that's kinda what they did.

No, it's not what they did, quite the opposite. Their account is almost two years old, yet that was their first post ever.

What they should have done was to continue to not post telling other people what they should not discuss.

They were doing just fine for almost two years not commenting on discussions they were not interested in or telling people what not to talk about, and they should have continued that trend instead of spoiling it.

It's always the ones who have reprehensible unjustifiable politics they don't want to discuss, who can't tolerate other people discussing politics.