Well it happened like this if you really want to know....younger umpire on field made perfect call, but so much complaining she looked to me, just looked and I gave her a thumbs up shaking my head yes. Well then coach came out she told them her ruling and they said she was wrong she said if you would like me to I will check with the UIC he is right there....so when she said yes I stepped forward told them it was the correct call, coach was upset, I told her that is how it is lets let the kids play. As i stepped back outside of the diamond a few minutes later a parent came up to talk to me, I am a somewhat social person so I told them the ruling, especially since the stands are on the end of the fence I knew he coudl not have heard the discussion on the field, that is when he went from calm discussion to pi**ed off, and then I went from social to doing what Sargee suggested....
But to answer your question I try my best to be completely unnoticed as much as possible when I UIC and I don't approach fans to tell them the rules, calm them down, assist in throwing them out yes, but not to shoot the breeze over rules....but if someone approaches me and I have time then I will attempt to discuss something with them as long as they are civil.
Edit: For the record I was so proud of my 16 year old umpire for how she handled this situation, remained calm and confident in the face of very upset adults (well people over 18)!!