Should you tip an ignorant waiter/waitress?

Me and my cousin always argue about this. We went out to the movies a while ago with our kids and when the movie was over, we went to the Hard Rock Cafe. The waitress we had did her job well, but she had the worst attitude towards us. When we left, my cousin left her a tip. I wasn't gonna leave her ***... show more Me and my cousin always argue about this. We went out to the movies a while ago with our kids and when the movie was over, we went to the Hard Rock Cafe. The waitress we had did her job well, but she had the worst attitude towards us. When we left, my cousin left her a tip. I wasn't gonna leave her *** anything.

What do you think? should you tip your waiter/waitress if they are a real b*tch, even if they did everything you asked them to and beyond?
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