I can't honestly say that I've had any real issues with any co-workers or team members that I've worked with. Even if there might have been an individual whose character or traits I didn't really care for, I usually just focus on my task and if I have to work with that person I'm professional and courteous regardless. Typically people who don't portray the sorts of traits that you want to see in a company don't last long. That's been my experience so I haven't really had any issues personally.