I think that it is crazy that someone believes they can refuse to tip for service based on someone's sexuality. When you apply for jobs it is illegal for them to discriminate based on race, sex, sexuality, religious beliefs etc. This person in a nutshell is paying the server her wages, but yet they believe they have the right to discriminate. Despicable. Welcome to the real world, you may not want to be like everyone that you meet and their decisions, but that's why they are their decisions. Live the life you want to live, be the person you want to be, and if you want to be a judgmental piece of shit, then keep it to yourself and leave your children and everyone else out of it.
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