I'm totally mystified as to the attitudes of some people on this thread.
VFRpilotpb thought he saw someone flying dangerously low, and wants to talk to the person concerned. Well, either he did or he didn't. If he did, wanting to talk to them seems a reasonable reaction, (while wanting to kill them seems quite understandable and human too). If he didn't - well, so he got the height wrong. Doesn't sound like a flaming/hanging offence to me. But while it's hard to estimate if someone was below 1500 ft (famously proved in some court case when someone was accused of breaking the congested area rule), you can tell if they're at around 100 or 200 ft. And even in Class G airspace we do have a 500 ft rule...any of you ever heard of it?
Vfrpilotpb posted here a couple of days before someone on Rotorheads made the unfortunate comment about "lesser mortals". I suspect they meant it as an in joke. We're like that in Rotorheads. It's probably a reaction to all the comments we put up with about helicopters...so ugly the earth repels them etc etc etc. But that's hardly a hanging offence either.
Maybe we should stop the name calling and discuss whether the best thing to do is:
a) Try to find the pilot and talk to him/her.
b) File an airprox
c) Do nothing, and accept that there are idiots around.
If I were Vfrpilotpb, I'd do both 1 and 2. I'd let others decide if I was right or wrong, after I'd tried to do something about it. I would certainly do SOMETHING! Idiots in the air are dangerous!!!!!