The question implies the anwser if you are in any way capable of doing something parkour related that is not related to it as a competive sport, it will necessarily not be an entirely competitive sport.
I feel like that sentence took longer than it should have for me to understand...

i no wed get alot of haters from other people that do sports like skaters and such
1. Using proper grammar and spelling is easy. 2. I'm not sure I see the reasoning behind this statement. It's possible just like anything is, but since we are pretty unrelated I don't see why our position would necessarily draw the negative attention you suggest. However, just like anything there are always detractors to something popular, skaters or not, so that is understood. There are numerous instances of both positive and negative reactions from "skaters and such."
EDIT:
No, It's actually ultimately impossible. Look at soccer. Football. Lacrosse. Running. Swimming. None of these are entirely competitive in the least bit (with how I think we are imagining parkour becoming). The majority of people in the world still do them entirely for fun and enjoyment, not money or popularity.
...and I forgot to add the group of people playing because their parents make them.

I feel that group might be larger than it should be, but that's another discussion completely...