I’d be suspicious of drawing those kinds of subtle lines in the sand. Malicious groups savor those kinds of guidelines so they can dance around them and test their firmness.
The spirit of their dialogue is designed to be disarming, giving them a foothold in this community. Their chosen behaviors and methods of influence are not what I want to see in a virtuous fediverse.
Maybe this is because I have a guarded heart after being burned a lot, but if you’re giving someone “one more chance”, that’s a good sign you’ve given them too many chances already.