I usually almost never talk about politics and usually stay far away from it as all it has done to me is make me more distrusting and angry at the world as we know it. There are a few occasions, such as getting frustrated at how some people sympathize with organizations/political parties with roots in neo-nazist culture, or if something is being presented as worse than what it actually is. If this is something that upsets you, tell me and I'll make sure to try and use muted terms.
While my usual stance on talking about controversial topics could be referred to as "Mention it once, then don't talk about it ever again", there have been times where my patience boils over and my anger takes over. I apologize for that.