It's his thing, he likes to be gregarious just like Chael, I find it funny but don't take it too seriously.
Personally, I think grabbing the championship belt is crossing the line though. That's not mic skills or being witty at all. In fact I'd say Connor was gotten to during that presser and he just reacted without thinking, grabbed the belt.
He can do the Discount Double Check all day, but championship gold gotta be earned before he can touch it.