People who don't tip are worse than bronys. Bronys may be awkward humans but they're still humans. People who don't tip are monsters.
Bronys are fine in the sense that they tend to stick to themselves when ridin' solo. A group of bronys could be a problem.
Non tippers though...that's pure scum. I stopped eating out a couple of my friends because they never want to participate in tipping.
They'll flirt with the waitress, marvel at how good she is at her job...then when it's tip time they want to rush out the fucking restaurant. If you can't tip, don't eat out: that's fucking simple. Nor can you really argue you "don't have the money" to tip if you can afford to eat out.
And to be honest/real/etc, I never really see my white friends do this shit, it's always black guys and Arab guys. So when I walk into a restaurant I can pretty much see the waitresses get that "oh fuck, a black guy..." look for 1 second on their face before snapping out of it. I almost want to tell them at the beginning "don't worry, I tip." I actually know waitresses, it's a pretty shitty job. Often times they're college students, or trying to make enough money to go to college. Or they're older and have been stuck with low wage jobs like that for years. So yea, people who don't tip REALLY piss me off.
BTW the best tippers I've seen are women. I went to watch some NCAA basketball with a couple female coworkers and a female friend of mine, and they wound up giving a pretty big tip to the lady who worked our table. Usually I tip 25% but we did 36% for her, just because.