The only time I experienced meta gaming that was shitty was when, due to everyone else asking me to, I played my evil cleric character. The one guy who absolutely loves my character more than even I do made a paladin and spent the entire campaign trying to prove my character was evil.

He didn't succeed, which made it hilarious, but it was still kinda annoying that every time I did anything I had to beat his fucking sense motive checks, and he would often try to claim he snuck around to watch me recast my daily rituals (because I basically kept Undetectable Alignment on 24/7) to try and glipse my aura.