Some people deserve their pathetic jobs

A couple of weeks ago, a couple of my mommy friends and I, along with our respective kids went out to lunch at a sit-down, national chain restaurant. I suggested the restaurant b/c I had a gift card that I wanted to use.
One friend was running a bit late, but my other friend and I got settled, got some drinks and ordered an appetizer. That was to be about the last time we saw our waitress. Our appetizer arrived just as our friend did. But our appetizer was missing chips, we had no silverware and my toddler's food arrived too.
By the time our main courses arrived, my toddler had already chowed through his entire meal, my baby had eaten and gone through most of his toys. Again things were missing, such as my friend's side of honey-mustard. I asked for a knife and was given a meat cleaver. Who brings a knife that big to a table with four kids?!
When it was time to pay, I asked to see the manager who took her sweetass time to come over. I tried to play it off a bit and said we knew we had a bigger party and that one person was late but in the mean time we'd seen a couple arrive, get served, eat, pay, and leave while we waited. Could she perhaps tell the waitress to move things along in future? And if this is the way it was going to be, then in future we'd just go down the road to their competitor.
I see the manager and waitress talk and I got them to comp the appetizer. But does the manager come back to explain the situation? No. The waitress takes my gift card and gives the receipt to me and it looks as though I still owe a balance. The waitress never comes back so I had to flag down a different waitress to explain it to me. Had our waitress come back, she would have gotten a tip b/c I would have told her to add it to my balance since I didn't have cash. But she never came back...Neither did the manager.
As I walked out I asked if they were corporate or franchise. Corporate. So when I get around to writing to Victoria's Secret about nursing bras, I'll write to this restaurant. I told them I would write and both the manager and waitress gave me snarky responses.

I wanted to turn around and say, "With that attitude and work ethic, it's no small wonder you work here."
I've worked in food service before and I know two things: be nice to customers if you want to make money and sometimes it sucks to serve other people.
If I'd been rude or nasty, I could understand the snarkiness. But with four kids at the table, it was insane that it took over an hour to have lunch. Come on! Did they really want to hear three of the four fussing? I would have thought that would make them hurry things along.
I even tried to ease the tension by admitting that we were a larger party and one person was a little late. But no, some people just deserve their pathetic jobs.
It's not like this is a five star restaurant that takes specific culinary training. This isn't a serve to the left, clear from the right kind of place. This isn't a knife and fork for each course kind of place. It's a bottomless bucket of chips kind of place. And there probably is the explanation for why I shouldn't expect much.
But really, if either the waitress or manager had more to offer (in their 20s and 30s), they'd have better jobs by now.
I just rest assured that they'll get theirs...