This question is one that you should have absolutely no trouble answering. If you do, then it’s obvious you’ve got a lot of work ahead of you. Do not panic, you still have time to learn. The semicolon between these clauses is the road sign. Since the blank is in the second clause, look to the first clause for direction. This person must always be right or have the last word in an argument. The second clause tells how much he needs the last word. He would rather be disliked than have what happen? A good fit would be a word that means “contradicted.”