Perez most certainly is not a psychopath - they are charming and adept at manipulating people to achieve their own ends.
I agree that the histrionic personality description seems to accurately describe him, but who knows - he knows the cameras are on him and he's trying to provide entertainment. His humour is infantile, but it's a very popular type of humour in the USA - just not so much here in Britain. He's a big character: extreme, over-exciteable, extrovert, creative, manic, and he needs a bigger outlet. He's approaching BB as if it's a big party.. but hasn't got anyone in that house who "gets" him, or with whom he can have fun and plot mischief. He was using the audience for that, but the audience aren't getting him, but he was unaware of that until he heard the boos.
I'm not going to try to psychoanalyse him, but If I was in the house, I'd like him. I like colourful, zany people, I like to laugh, party and have a carry on. I'd prefer to cope with Perez being challenging, annoying or tearful than be around someone who never challenged me, was as dull as dishwater and tried to dominate or bully me into changing my future eviction nominations.