KIP MOORE decided to "unwind" after his concert Friday night in Fairfax, Virginia . . by entertaining some frat boys and sorority girls at George Mason University.  Afterwards he posted Instagram videos of his frat house experience.

Someone criticized KIP MOORE for doing a free show at a frat house, and that set him off.  He Tweeted, "In regards to the idiot who complained, our fans and us don't care what you think.  We play for children's hospitals, troops, charities etc., but that's never seen.  If we choose to hang with a frat house then that's what we'll do." To see all the tweets from Kip about the frat here!