To hesitate is a sign of intelligency as well. You can't have all the answers for all the questions all the time at the pace he normally throws, specially when you are dealing with another fast speaking, heavy accented, professional trash talker like Bisping and trying to decode all the sarcasm beneath every sentence. No, that example doesn't demerit Sonnen any bit. He got where he is now complementing his fighting skills with his mouth, right?
No he got there solely off of his mouth and the annoying fans that gobble up his gimmick.