A$AP Rocky encountered some competition at the weekend when one fan was caught playfully ‘trying to flirt’ with Rihanna. Of course, he wasn’t having any of it. The celebrity couple were out in New York this weekend, celebrating eldest son RZA’s second birthday. It comes just a week after Rihanna and A$AP Rocky skipped the prestigious Met Gala after reports the Umbrella singer had come down with the flu. A$AP Rocky jokingly ‘squares up’ to fan trying to flirt with RihannaIt’s no surprise the singer gets attention everywhere she goes, but it’s going no further if Rocky has anything to do with it…