When I see a beginner with a very expensive board and other gear I also have the tendency to show him how it's done. Not because I'm jealous (I have no reason to because I love my board), but because he wasted a lot of money on gear he can't fully utilize and his skill level doesn't correspond with the money he spent. In short, it looks like he's showing off and he has no reason whatsoever to do so. Some people do it to look cool (this is ofcourse not always the case but seen as nonetheless), they just make complete fools of themselves and other people often have the tendency to make that clear one way or another.