Perhaps the parent objects to hellbanning on principle, and is partaking in some small amount of civil disobedience to right a perceived wrong.

If a single post happened to result in my being hellbanned, I would surely hope someone would tell me so I didn't continue wasting my time trying to participate, only to have it sent into the void. I could instead use it as a signal to either move on, or do some self introspection about my actions which resulted in the ban in the first place.