Originally Posted by MR.Wonderful
I want to settle this " internally" meaning no HR department or superior. I just don't want to lash out out the guy and look like the crazy one...
Over time his meanness might make you get frustrated and lash out at him directly, which would only make things worse. Chances are your work performance is already decreasing.
Even though you don't want to, I'd just think about making a complaint, if you don't feel comfortable with your HR department than to the department of labor for harassment. And yes, it's harassment.