Just a guess, but the dumb friend probably threw a temper tantrum over his buddy getting thrown out and got himself banned as well.
Edit - if I owned the range, I’d likely ban the friend to prevent a retaliatory attack. Imagine the friend returning to “target shoot” but starts shooting employees instead of paper once he’s Condition 1.
That kinda stupid is contagious, no way I'd let either of them finger **** a gun on the range ever again.