I only really had one time that I got ignored. It was at a unFRIENDLY restaraunt.
It was on my honeymoon, and we both were tired and didnt feel like a big meal so we hit the chain store. The burgers came up in a reasonable time, then we ordered ice cream. A bus came in, the bus people ordered ice cream, ate, got coffee, and I had had enough.
Normaly I am pretty easy going and understanding because I work in a service industry also. But it was just ice cream, nothing special and they were apparently able to make it because the bus folks got served.
Anyway, a penny tip was left. I shouldnt have paid for the meal but I did. The manager wanted to give me coupons for a meal in the same chain restaraunt and I told her I didnt need them because I wont be eating at any unfriendlys again. Havent since.
I can understand slow, crowded, understaffed, or theat good food takes time. I cannot understand being dropped down in priority after the order is taken.