Ill rant for you. If I see a pitbull heading my way I will pick Tia up. I don't care what the owners think , Ill do it for her .Her safety is my priority. Also I will not listen to an owner which says "hes so friendly" I will go on my instinct with ANY dog but pitbulls forget it , I don't give them a chance. They have locking jaws which would kill my baby with one bite. I would never let her meet one if I could help it.
On the other hand you have brought a pitbull up with a yorkie and you have 100% trust , good for you but just don't expect people that don't know your dog to do the same. Sorry to be mean but it is my honest opinion.