Here's what I think may have happened. I've figured out it probably wasn't a friend, since I had the lan there in July and got banned in late August. The last time I remember playing int he server was the night the new radar came out. Also during that night, the admin plugin broke, so scope weapons were allowed on scopeless servers.
The best reason I can think of is people were playing with scoped weapons that night in the no scope server, and I may have flamed a fee of them, which I wasn't supposed to do. Is that what you remember happening? Anyway if that's it sorry for doing that, I just forgot/ got angry I guess with people ignoring the obvious rule in the server saying " no scopes"