The reason why most people (what you mean is rich people) complain about taxes is because of the belief that they earned the money themselves and they shouldn't let it be spent on other people. On who? For example, on white girls who get impregnated by mexicans, have 10 kids, and live off of welfare (used this stereotype to rile you up). "It's my money, I earned it. I want to keep it." It's not that the rich guy can't LIVE without the money that goes to taxes or that it affects his life tremendously, but it's about the principles he holds to be evident to him.
I have no sympathy for those who earn $250,000+ and complain about higher taxes. But if I ever end up making $250,000 I'm voting Republican and it's that simple.