The sex in Stephen King books hasn't bothered me, but I possibly haven't read enough to say. I thought he handled it well in The Dead Zone, with enough allusion and emotion. I don't need graphic description or soaring romantic prose to put me there.
When he gets to stereotypes, it can be offputting. I hadn't noticed it for gay characters, but I can see that happening. I winced at Rat-man in The Stand. I thought Rainbird was over the top in Firestarter, although to be fair, the character was meant to be larger than life.
When it comes to political discussions, I like to encourage thoughtful exchange rather than attacks on the person or a range of political views in general. But thatt apparently makes for boring, unfruitful political discussion.