I can imagine that if I had super powers I'd be kind of a dick. It would be hard not to from my point of view. Sure I'd help people out and maybe I wouldn't be a super villain, but it would be hard not to be a dick at least most of the time. Not because I'm mean, but because I think super powers would have the tendency to detach you from real life issues because you can overcome such issues easily with your powers.
If you get used to doing things at super speed it can probably get annoying to do things at normal speed to appease normal people. I can imagine myself eating at super speed, but that wouldn't fly on a dinner date or if you go over to the girlfriends house for dinner. Spending an hour doing something you can do in a minute on your own can probably irk anyone. That's just one possible avenue and why I would probably couldn't help but act like a dick if I had super powers.