In my opinion you shouldn't be showing him like this - even though this aggression seems to be against certain individuals there could be a time when he takes against the judge.
Yes, getting kicked out of the ring because your dog growls and won't stand still for the judge is very very embarrasing!! This did not happen to me with a B but the Shiba Inu we had. I was 16, it was her first show and she growled at the judge and would not stand still on the table…...I got excused from the ring.....in my hometown.....and its a small little show, 175 dogs. After that show we got her spayed, as I did not want to carry on that temperment in puppies. She was a very good dog but I am glad we spayed her because she had an attitude! She was my first show dog and we did not do proper research on the breeder first. Sorry, this is getting off topic.