I think they should come up with a precise definition, but that’s hard and I see no reason to wait for that when presented with someone who obviously crosses the line.

This feels like yet another instance of programmers applying a programming mindset to human problems. When presented with an instance of a problem, we want to solve the general case. That’s fine for code but often falls flat for people. If somebody is doing something terribly wrong, it’s ok to look at the individual case while you figure out how to handle it in general.