The amount of anger to someone cutting in line is going to be directly proportional to a number of variables:
- How far up in the line the person is cutting in.
- How long the line is currently.
- How long the people behind the cutter have been waiting already.
- How many people have already cut in.
Example: If you're #5 in a line of 10 or so, and #3 lets a buddy in, and that's the only person who's allowed someone to cut for the entire four hours you've been standing in line, most people aren't going to get to worked up.
If you started as #5 in a line of 10, and seven hours later you are now #30 in a line of 50, and someone near the front just let two more buddies jump in line with them ten minutes before opening the doors... yeah, you're about to see some pissed off people.
There's a line (figurative, not literal) that is going to be crossed at some point. It's usually around the time the first person gets upset at someone else for allowing a buddy to cut in front of them. When that time comes is anyone's guess, and is all based on the most unknowable variable of all - the human variable. But once the line is crossed, there's no going back.