Sounds like you're cheap, too.
You are also personally responsible for the amount of charity in your heart.
Tips for services rendered have nothing to do with charity, and blending the two concepts is an insult to people who earn a living by providing personal services.
That's one reason (besides the notion of rewarding poor personal decisions) I find the comment offensive. Mixing charity with payment for service dilutes the reward of earning a large tip by providing excellent service, in much the same way that (to use an example beaten to death on FR) "affirmative action" dilutes the recognition of excellent performers who just happen to be members of a preferred class.