Since both Trump and Kammie voters are human beings and Karenage is a human rather than a partisan phenomenon, there are plenty of Prog A-hole non-tippers out there.
This Trump voter's attitude toward restaurant servers, male or female, is that they get enough @#$% from the very occasional A-hole and I/we try to be VERY courteous and tip well, especially when the service was particularly good (BTW, we do NOT take it out on the server if the kitchen screws up!). We are probably fairly typical of Trump voters.