I hate it when others complete my sentence. The only exception is my sister. If someone completes my sentence, I will still complete it anyway. I have a very good friend who stutters as well and he completes my sentences all the time but then apologizes as he does not like it when people do that to him. It is awkward but I no longer think it is embarrassing. I stutter and it is part of who I am. If people have an issue with it, then it is on them.