I hope someone says something to me if I foul them... the problem is if someone else fouls me I wonder whether they were just being punks or didn't understand that they were fouling me. If I know someone on the course and I think I may have fouled them (or that they fouled me) I try to find them at the end and ask what their interpretation was. It is hard to make that confrontation sometimes but it is honestly the only way I will learn (or they will learn).
For example... I was driving one time and felt I had the right of way at a mark. They screamed at me and I was like W.T.F.? I found that person at the end because I honestly wondered whether I had truly fouled them as they have a lot more experience than I do racing. They replied to me when I asked what was up: "no problem, you totally had me."
Why were they yelling to start with.... they were having a bad race....