betta gone bad?

I just split up my community tank after many
months of operation because all of a sudden my male betta was being
harassed. It does happen.

Please clarify whether your male was getting harrassed by a female
Betta (which is what we were talking about) or different type of tank
mate?

I do know of people who do it, you, John and a
couple of others but the majority do not keep both together. I wouldn't

say it's wrong I just think it's less common and may come with
consequences. Surely I'm not the first to give warning on this subject.

It's common practice to keep them separated.

Of course you're not the first to give warning, but it's probably
because for some many years people were conditioned into thinking that
you cannot house them together in the right situation.
Heck, look how often even today that folks don't have a clue that
Bettas can go into a community tank without killing every fish in
there.
People still think they're killing machines.