I only use Hacker News and Reddit. And I always manage to get banned every few months, so I guess I'm a "bad actor".
Usually I start off OK. I can rank up 1000 points on HN or 20k karma on Reddit quickly because some of the discussions are interesting and non-inflammatory and I have interesting things to say.
But then some topics veer into domains that make me angry (hello politics), or I find a comment inappropriate or unfair, or mod behavior hypocritical. And I share that in a post that gets flagged or downvoted, and I get banned.
It is hard to detect because I think anyone has potential to become a bad actor in the eyes of a mod. There is no such thing as an unbiased mod. They will rub some people the wrong way with their comments or actions.
Some personality type's are just not compatible with what mods want to see in their well-tended gardens. I've never stalked or hounded anyone, and I've disagreed with dang's assessment of my posts once or twice, (FYI DanG is a paid mod, not a volunteer, which is probably why he's so calm about it, even though he get's riled too: read the New Yorker article about him) but this appears to be a problem techies cannot solve. Why do I say this? Because it's been going on since the 80's with Usenet. Almost 40 years of trolls, and tech hasn't solved it, but it has created some systems that have worked to keep the weeds out of the gardens. But gardens still need weeding.