As everyone has said, it's all a role, he's just doing some acting, although he needs to improve on his acting skills a bit.

Floyd wasn't like this early in his career, probably 7 to 8 years in his career he started acting like this to get people to buy his fights once he started to realize the humble him and nice guy role wouldn't cut it.

I've been following him since '97 or so and just watch his prefight conferences from that time up till until he started fighting on big PPV fights and it's a sharp contrast.