Online, ignore, block, whatever means are available, like bullies, PA people feed on a response.
I'm not sure that they do. In fact, it's sometimes quite the opposite. They are often people who say they don't like conflict, by which they mean they don't want to take responsibility for their actions, so they come at the problem sideways.
As an example, I had a colleague who wanted everything at work to stay the same, as she was basically lazy and didn't want to put the work in to keep things up to date. She didn't admit this, of course, and would always be 'ill' when there was a meeting to discuss future planning. This meant that she avoided the 'conflict' involved in refusing to do what everyone else felt was necessary, and she could pick people off by saying that she hadn't been involved in the decisions ('poor me') and that they had been made behind her back (playing the victim).
If she was forced to go along with what had been decided, she would do the same - just go off 'ill' when the new thing was about to roll out, so it would fall to someone else to have to update her work ready for when she got back. You could predict with certainty when she would be off sick.
She 'knew her rights', so always got paid when she was off sick, and could play the system so that she came back for just long enough to get back in credit and be able to go off again, claiming stress. If people called her to account they were accused of bullying, and so on.
At no point did she ever speak her mind and say that she wanted an easy life with no extra work. Nor did she make a case for not doing the updates that others wanted to do - both of those things would have been assertive. Instead, she made life difficult for her colleagues by just opting out with a smile, or casting herself as a victim.
She was the same socially - if she didn't want to go somewhere, she would never say so, but would pull out at the last minute, often leaving people high and dry. On the rare occasions that people called her out on it she would cry and say that she hated conflict and just wanted to get along with people, making the other person out to be the villain of the piece, when in fact it was the colleague who always got her way, one way or the other.