Many interview processes generally paint the company in a grimmer picture than it actually is. So I would do additional research than turning down an offer because of a bad interviewing experience. Of course, you are completely in your right to do so, but it might not be the most optimal behavior.
Usually, interviewers are just bad at interviewing and aren't really aware of what proper behavior is. It actually isn't easy, nor is it a desirable activity nor do you really get points for it in your performance review.
