Replying to People getting in the way.

Last year I had more close calls than all of my previous seasons combined. Most of these people are skiers/boarders on rentals who decide to have a picnic in the landing of the jumps or cut across a rail line without looking up hill. I had one incident last year where a little girl (Probably 5) decided to stop in the middle of the landing of the last jump right while I was coming off the kicker for a cork 7. Long story short I was able to stop and only managed to trip her with one ski. However her father having witnessed this (also a first timer) decided to come over and chew me out for a good 5 minutes to which I just walked away from. What close calls have you had? And how do you deal with angry parents or skiers after an incident?