Now, most importantly, I want to underline how ridiculous Curtis' Forum is (off course):
https://forum.flightgear.org/rules.phpBy their rulebook
5. Our FlightGear community is diverse, and we must all respect each each and be tolerant of other opinions, particularly if they differ from or own. While politely disagreement is expected, to avoid flame-wars if it is clear that you are not going to changes someone's opinion, agree to disagree and stop.
No one seemed to stop arguing to Cactus231. And no one seemed to simply agree to disagree, either.
But more importantly
Moderator actions
g. Temporary banning of members for 24 hours. Repeated or particularly serious offences may result in increasing bans (48hrs, 4 days, 8 days...). The moderator will add a publicly visible post indicating when this has taken place.
h. Permanent banning from the forum. The moderator will add a publicly visible post indicating when this has taken place.
1. In the specific case of Cactus231, he was removed from the forum permanently, while still being a new user and given no chance to adapt. And in a clearly hostile environment.
2. The moderator
bugman jumped straight to permanent banning, instead of issuing the indicated temporary bannings in "Moderators actions, sections g and h" of their Forum rules.
So clearly, he follows no law.