If you got a norty note for something, then from my experience it is intended to be for the best- that is, to stop the Forum going downhill.
If you disagree with a Mod's restriction, then as Roper says, you exchange a couple of PMs to sort it out.
I hadn't noticed whatever you wrote that ruffled feathers, but I wouldn't expect it to have been major.
It's a pity to walk away from something you enjoyed a lot because of one hassle, but I know people do it all the time in social groups.
I doubt anyone will think less of you if you just forget the matter and move on without needing to say more.
Lurk for a while...