It sounds like for whatever reason their is a personality clash. Sometimes personalities at work just don't fit and conflict arises. I don't know if he is rude but he is obviously demonstrating poor conflict resolution skills himself. I absolutely hate these email fights too. Be careful of how you speak because you can only change you. Instead of ignoring emails respond to them in a brief succinct way that is professional and to the point. By ignoring them you think you are avoiding a fight but he may see it as passive aggressive. This mis perception can make things worse and kick in his childish behavior. I would be just as appropriate and brief in person. When he is not facing you, say in a completely neutral tone a statement that allows him to know that you have noticed his body language. Of course you could consider leaving the job but that may not be possible. You should consider how much your happiness is worth. If you want to stay then you have to strategically face this without appearing hostile. Always try to be the bigger person no matter what the situation.
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This is an excellent answer, doctor, if only because it helps me to realize that I'm not losing my marbles. Your entire answer is helpful, but especially your suggestion on locating a specific technology or email policy.
It's strange...I actually do some organizational developent work (strategic planning) for my group and I have pointed out to him the problems he could be creating. (My role is that of an engineer AND an "organizational development-type" person in the group). I'm also trained in Peter Block's "Flawless Consulting" techniques.
Thank you *very* much for your help.
(By the way, I realize I'm not perfect an in some instances he may have valid points...that's why I think ADR worked so well...but, again, he rejected it).
(I have a separate but related question I will follow up with...)