If you hate fighting games why are you playing SC at all? Don't take that the wrong way, I look at hate very very stringently because it's a strong word that people throw around too carelessly IMO. Either way I think we're talking about what your mindset is when you step into a round against another person, not necessarily flying yourself to get into a tourney. I do think we are all correct in assuming a competitive player is one that goes to tourneys.
Anyway, I always start off playing to win, to beat the other person into submission. The problem is that no one I usually play against wants to learn, so in the end it becomes a regular beatdown. Ravariel is partially right in my opinion, with the caveat being competitive play is MOST fun (not only) when the two people are relatively equal in skill. However, it is just as fun to play competitively and lose 80 times in a row if you are a person who is learning. The first time I picked up KOF my friend was already (and still is) leagues ahead of me, with his execution and stuff. We played for almost 5 hours straight though, and I lost pretty much every time, but each time I was learning, getting used to the game. It culminated in us meeting up next time and now I can give him a run for his money, even if I play it SF style with limited combos and focusing on my fireball traps and stuff.
One of the things that comes up in these discussions that makes me scratch my head is the "work" counterargument. Some people say that competing is overrated because then you're not playing, you're working. IMO if you have that kind of philosophy you're just a lazy ass who isn't willing to learn something to be better at what you're doing. I thrive off of pushing myself in games and success is the most fun I can get in any.