While some of those really are excessively stupid stereotypes, some of them make no damned sense.
I HAVE A BUNCH OF GUY FRIENDS, so I MUST be screwing them all.
Well I dunno, there's your sudden bursts of "hey guyz I just cybered with Splapp" and all that.
I WATCH PORN so I MUST be perverted.
Yeah I save every bit of sick hentai or whatever I find for the lulz, yet I'm a normal, virgin-eyed person who only thinks of consensual sex.
...
Wait, what?
Seriously, normality is overrated.
I CHAT, I MUST be having cyber sex.
See above. If you don't want people stereotyping you, try not to live up to your stereotypes.
I have my OWN spiritual ideology; therefore I MUST be WRONG or MISGUIDED.
Can't argue with that, it really IS a stupid stereotype.
I don’t want a BOYFRIEND so I MUST be Lesbian.
Saying "IGUANA, I'm GAY" once in a while, trying really hard to prove that it's true might help enforce that one.
Also some of these only apply to one single gender.