Even reputable members can make a bad post now and then. We aren't perfect, we have just built a reputation and gained the respect of most in the communities we are a part of.
That's the point, no one is perfect
as happens outside, for example, with restaurant reviews on Tripadvisor
no one is perfect, using the punitive method to fix bad behavior doesn't work, just talk
if he is a repeat offender it's another matter, I'm the type of person who talks about face 2 face person with whom I feel annoyed or uncomfortable in order to understand how to resolve the matter together
What's the point of giving away negative karma? for nothing only to foment hatred