Patrick Mahomes was clearly less than pleased to see his little brother pouring water on smack-talking Ravens fans ... telling reporters Wednesday, "Obviously it's something we don't necessarily want to do."
Jackson Mahomes was caught on camera dousing Baltimore supporters with a bottle of water following the Chiefs' loss at M&T Bank Stadium on Sunday.
The video -- which shows fans jabbing at Jackson after the game before he tossed the liquid all over them -- quickly went viral ... and Patrick said in his weekly meeting with media members that he wasn't thrilled with it all.