I've worked at my job for 6 years, and for the most part I never have these problems, because we are adults and the vast majority of us act like adults.
However, as with any group, there are a few people who are stuck in high school and use inappropriate measures to convey their displeasure to others.
I had a bad, bad week at work last week. We have a new job responsibility in our group for which we have received inadequate training and the group from which we have assumed the work is as confused as we are about who does what, etc. This responsibility was supposed to be a step up from our current duties, but in reality it is a much lesser position, mainly because our lack of knowledge puts us far under the tier 2 group in terms of being able to complete tasks properly.
So after a negative interaction with the tier 2 group, I went to complain to my supervisor about the responsibilities, the lack of training, the other groups treatment of us, etc. I'll be honest, I was totally bitching. I was tired, frustrated, and angry. I mentioned the name of the person in the other group to my supervisor (because he asked me what brought all this on) but I was not complaining about him... it was more the situation.
Well, someone in our group told the person in the tier 2 group that I was bitching about him to the supervisor, so he came over to me and yelled at me because he felt I should have taken it up with him rather than the supervisor. Unfortunately he didn't give me the chance to bring it up with him... I was actually checking with the supervisor to see if what he did was correct before I talked to him about it. As it turns out, he (the yeller) was in the right in asking me to perform that task.
Now I feel attacked by this person. When he yelled at me he didn't even give me a chance to defend myself, he just yelled at me then walked away. He was clearly just trying to intimidate me, he had no intention of letting me defend myself or even settling the matter between us.
So what should I do? I feel really uncomfortable interacting with him at all. I hate confrontation and would have preferred to avoid this situation all together. As it stands I'm still performing the new responsibilities, but I am considering asking my boss not to do it anymore, because it sucks so much, and also because I don't want to deal with this guy anymore.