I've heard of people being invited over to a BBQ being served hotdogs and hamburgers while the host cooked himself a steak, or offering steak to the adults only and assuming the kids would be happy with burgers and dogs.
Also heard about wedding receptions where the bride, groom, & their table eat something like surf & turf while guests received chicken.
The worst recent memory is the hostess (former neighbior) at a summer holiday party complained non-stop about people going into her house to use the facilities. She also cleans constantly, and if you dare turn your back or use said facilities she dumps your drinks. The partying takes place in the yard, btw, not in her house and I brought my own alcohol and contributed a 12 pack of beer. This happened two years in a row so will nope out if there's a third invite. She also drinks in excess and obviously pops pharmaceuticals so she gets obnoxiously wasted.