I told him not to confront him at work. Deal with it off the clock and off company property. Or in the alternative go through official channels and notify su.periors at work.
Going through official channels may not work very well however. Depends on what type of upper management you have at the company. They will side with the superior normally since they are considered the more valuable person to the company. Also you will be labeled a snitch. So if you got to management make sure you have evidence. Cell phone recording would work nicely!
I agree, higher-ups usually have stronger emotional, and business-related bonds with each other.