He is such a fist magnet because he never stops insulting people.
fist magnet
idiomAn annoying or angering individual; someone who compels others to assault them in rage.
Everyone in the office tries to avoid him because his constant arrogance makes him a total fist magnet.
His relentless habit of mocking strangers in crowded bars eventually revealed him to be a genuine fist magnet, drawing the ire of everyone nearby.