Yeah this is unacceptable behavior. That said I think this is something that ought to be just explained to him because he might legitimately be a total dumbass.
That said I wish more restaurants were like Fuddruckers or Firehouse Subs and just let me grab my food from the counter myself once it was done. I don’t really want to pay someone to carry my food & drinks to me and be possibly insincerely nice to me to increase their tip or whatever.
He was being a bad person the moment he thought “I hope she gets abused by her boyfriend.” No need to do research on the guy after that point.
That said, he’d only saying that because hes incredibly close to being depressed and in extreme self loathing in response to being rejected and trying to protect his his will to live via delusional projection and lashing out. “She’s the one with a problem not me. I’m great. She’s a piece of shit and deserves to suffer.”
People who don’t delude themselves about how great they are unfortunately usually don’t respond to rejection with “I need to improve myself” or “I’m just not his/her type I’ll find someone.” but with “I should kill myself, its hopeless. I’ll be romantically alone forever and I can’t take it.” and the sheer mortal terror of potentially thinking that way causes the delusional insulation and projection.