Need Advice with an Intruder?

Just thought I throw this out here to ROFF.
I got a problem with one of the anglers at the casting ponds.
He's a great caster, an old-timer but he intrudes by coming up to
other casters using the facilities and wants them to cast his way. We never
ask him for advice, he just intrudes. A few times he has grabbed the fly-rod
out of my hand to demonstrate without asking. I've also seen him do that to
others casters as well. I try to be polite, but I don't think he realize
what he's doing. He also goes on and on how he used to be a tournament
caster. I have expressed this problem with others at the casting pond,
they're also not sure what to do. I have thought of talking to him in a
nice way and not hurt his feelings, but I was told he's the type of person
who flies off the handle. I know it sort of sounds like an Ann Landers
thing, but thought I ask here first. Any suggestions?
fwiw,
-tom