you can give advice or critique without being mean to a person. also, you should honestly be flattered anyone gives a shit about you or what youre doing enough to take your photo in general.
it just sounds like you want your friend to be as interested in capturing skating as you are, in a specific way that you are, which means... you should just get a camera and start taking pics yourself. but you might find that you dont have an eye/knowledge for photography, you just have an eye that knows to get a low angle with a fisheye when capturing skateboarding, because its what we have seen a million times.
we tend not to shit on people who arent good at skating because hey, they are trying, having fun with it, and thats the most important part, as cheesey as that might sound. id say that can apply to photography when its clearly a hobby for the person. but thats just like, my opinion, man.
i look forward to seeing some of you post your photos in the photography thread!