The club responded to a post containing an image of the Gunners great and current France international, jokingly suggesting that the only legend in the picture was the 20-year-old
Manchester United's official club Twitter account has some top banter, especially when Thierry Henry's involved.
France international striker Anthony Martial posted an image with the former Arsenal striker, accompanied by the hashtag "#legend".
@AnthonyMartial And what about the guy behind you?— Manchester United (@ManUtd) October 14, 2016
But United's Twitter account was having none of it, suggesting that Martial was in fact the footballing great in the shot.
And judging by this reaction, we think it's fair to say Gunners fans weren't too impressed...!
@AnthonyMartial he's way better then you even though he's retired— Aaron Metz (@aaron_metzz) October 14, 2016