5 Seconds of Summer Don't Ask Us About One Direction!!!

11/15/2015 7:57 AM PST

5 Seconds of Summer is one of the hottest groups around, but one thing still gets under their skin ... a mere mention of One Direction.

We got the group leaving LAX Saturday and when our photog dared to mention their arch rival, an agitated handler laid down the law.

Boy band battles ... they're fun.