Mine's gotta be the guys that ask 'so how much money you have that thing?'. After my reply of 'a few hundred bucks', or if talking about my 1/4 scale, '8 or 900 bucks'. Then there all like 'geez, I wish I had that kinda money to blow on a hobby'. All the while there is a $15,000 snowmobile sitting in their garage...
It is my opinion that compared to 4 wheeling, snowmobiling, and even golf; RC is a pretty inexpensive hobby.