1 of the demographics that the dems pander to are notorious lousy tippers. It's a well known 'secret' in server circles plus the added bonus of them being quite demanding of the servers time with lots of special requests. Ever wonder why groups of 6 or more get the tip added to their check?
I'm sure the above fact and that democrats are niggardly overall would back up the link's claim.
Years ago, when my sister made money in various venues as a waitress, she confirmed your remark - which I've heard many times in years since - and added her own experience in who tips well and who doesn't.
Old people tip poorly. She never faulted them much for it, because in general, they stayed the shortest time at their table and ordered small meals.
GROUPS tipped *terrible* as a whole when divided per capita. I swear EVERY time we had a group check, I would toss in an extra ten above my own meal and tip - and we STILL DIDN'T have enough to cover the meal, much less the tip. I was only ever able to attribute this to a couple things - one was, we had severe cheapskates who were paying WAY less than they ran up (I mean, seriously, when you know you ran up a 15 dollar lunch and put in **30** - and it ain't enough - a lot of people are not doing their job). The other reason was - some people are just extraordinarily stupid when it comes to how much they "owe". "I ordered a 10.99 burger - I put in twelve." Moron. 11 bucks - and 3 dollar drink - and tax - and tip - you're already about six to seven bucks short. And then there's the beer you ordered - and the appetizers you ate from ----
So yeah, I get it why gratuity is added for groups. It only takes about two or three total morons to screw it up for everyone.
My sister said that typically, young men on dates tipped well. But young people dining alone tipped poorly and she said professional women tipped the worst.
One tossed a dollar and said "go to college, sweetie". She was IN college.