How to deal with shit tests at work? I am often challenged by this one guy in particular, he plays the alpha role with his walk and often chats a lot, really he's lazy, unmotivated and has all he really does with his life is smoke weed.

I'm often openly challenged and tested by him, one pathetic example was today he pointed out I missed a hair after shaving (which I admit I did fall for because I'm quite gullible).

Other times he will make comments on my day to day actions and I mean most of the time I just ignore most of it but I feel sometimes maybe that makes me come across as weak?

How should I go about interact with him in day to day work life when I am tested?