Hi Tom

Yes those things can be frustrating.  For those who are perpetually late just ask them to turn up half an hour before you actually want them to be there and say you will meet them inside at the venue that way you wont miss out. Or if they are inviting you around for supper, but it takes them hours to serve the meal have a snack before to stop the hangry effect.  If you find there kitchen hygiene hard to stomach suggest eating out, maybe trying somewhere new or a shared offering between lots of you and just diplomatically and stealthy give their culinary dish  a wide berth.