Low blows

OOF: Nick Jonas lashes out at “fan” for making a super-rude dig at his height

Rule of thumb: If you ever spot a celebrity walking down the street, and then have the nerve to race up to that celebrity and insist he take a photograph with you, it wouldn’t be particularly chivalrous or gallant to later post said photo to Instagram alongside a nasty jab at his height.

Related: WATCH: Nick Jonas makes out with another guy in mixed martial arts drama “Kingdom”

Nevertheless, self-proclaimed Nick Jonas fan Zak Hanzal evidently didn’t receive this memo, and gleefully posted a photo featuring him, arm affectionately wrapped around shoulder, standing alongside Jonas — and then the certifiably douchebaggy comment, “U need a few inches on you bruh.”

Needless to say, this didn’t sit at all well with the pop star, who took it upon himself to huffily write back to Hanzal, saying, “You need some manners ‘bruh’… I didn’t need to stop to take that picture with you. Just rude. Very rude.”

Low blow, Zak. Low, low blow.