Thanks for your replies everyone, I'm enjoying reading all of the comments.
One thing that would put me on tilt (and I didn't include it in the poll) especially now is someone who is obviously sick and keeps coughing all over the table without even attempting to cover their mouth, and doing things like handling the cards and chips with snot all over their fingers. If somebody was doing this I would most likely try to get the pit boss to kick them out.
Some people have zero consciousness of spreading infection, I remember traveling abroad once and riding a public bus with someone in the back who was very sick with something and kept spitting and blowing his nose on the floor.