Does anyone know the correct etiquette?

Curious to hear feedback on this subject. I was in a funeral procession a month ago and I was so angered and saddened by the cars that sped past us but really the people who cut in the line and then one guy who cut in and stayed in. I had enough so I sped up, pulled up and told him he was in a funeral procession. His answer was " I know but I want to turn right" I lost it then, no respect for anyone on that day. I dropped a few choice words and then cut him off and wouldn't let him pass until everyone else had. I have to say I was truly sickened by the lack of respect that many but especially this one guy did. I hope it's not a sign of our culture but I think maybe it is. I have a feeling that this may be more of a problem in our busy busy go go area also. I don't think you would see this behaviour in a small town or down South for example. The police did a great job until the very end when this one loser jumped in. Anyway curious to hear any thoughts you may have on the subject. Especially any regional differences. I'm telling you it was a sad sight, he wasn't the only person, just the biggest offender.