Jason Derulo has a zero-tolerance policy for being mistaken for another R&B superstar — so much so, he attacked 2 guys at a Las Vegas hotel for calling him … Usher.

Law enforcement sources tell TMZ… cops were called to the ARIA hotel during the early hours of Tuesday morning after Derulo threw fists with the men.

Eyewitnesses tell us Derulo and one of the men were passing each other on an escalator when the guy seemed to troll Derulo by yelling, “Hey, Usher! F*** you, bitch!!!” That’s when Derulo got pissed and punched him right in the face, sending the dude to the floor.

Source: TMZ