In this context, it's matters related to government, politicians, or the general culture of a country, in which there are two or more major camps of conflicting opinions, where a good deal of people in one or more of those camps view the other camp as evil because of their view.

If the post is in a community where only one of the camps is significantly present, but the post is attacking the other camp, it is still political.

Why do you ask? Are you hoping to expose some inconsistency in my definition? Maybe use it to call something I like political with the expectation that I'll disagree with you? Or were you expecting my definition to be biased, calling something political that shouldn't be, so that you could expose me as a moustache-twirling villain?