With an attitude like that he is not the kind of person I would want around anyway so it may be best if you just end it now if he can't grow up.
I am assuming he is young from the sound of it? I am almost 30 with my second child on the way and the only one who is jealous and nasty because of my tanks is my 10 year old brother who tells mom he needs a big tank because I have big tanks.
None of my friends hate on me about my fish, they all know how hard I have worked for what I have and are all very impressed with my tanks and the happiness they bring me like a true friend should be.
Tell him to grow up or go buy a helmet as life will be very hard on him if he's that bent out of shape about your setup(s).