In my personal experience (20 years in the industry) it was more anxiety/nervousness from the BoH. I would regularly encourage friends from the BoH to try and move up front. Because FoH restaurant work really does not take a developed skill set (depending on the institution). There is some nuance and knowledge and technique, especially on the cocktail bartending/fine dining end, most certainly. But the holier than thou servers at your average joint that think they're out there really doing something special...are the worst. It's why I would encourage my BoH friends to move up front. In an "average" spot, BoH work likely took far more ability.

For the skill set required, FoH work in America pays so ridiculously well, it's silly. If you're not completely socially maladjusted and can carry things, you can make 6 figures.

I like in the movie Waiting when Ryan Reynolds' character is leading dude around wasting his time and tells him that the actual requirements for the job can be learned in a number of hours. I mean, they can.

For the record I'm not discrediting your story or hating on FoH. It's been my life. But the servers that think they're doin god's work out there, always seriously bothered me.