Rashford's presence at the basketball match sparked an angry reaction from United fans, with @BudHill4ever summing up the mood by replying: "What a clown".
"I dunno man seeing a player enjoying himself while putting in sub par performances week in week out is the same as seeing the dude who owes you cash splashing out in the club," said @United_Beanz.
X user @Atankpa520879 added: "Instead of him to be on the grass running and working on his shooting he’s outside in New York watching a basketball game."
"Why is he not in training?" asked @peanut111822, while @SullayJr said: "Imagine how crap he has been instead of training getting ready for [Ruben] Amorim he's busy watching basketball... No wonder we've fallen."
Meanwhile, @aobrien7 had a pop at the attacker's former coach, saying: "Watching basketball in person since he doesn’t have to play it any longer under Erik ten Hag."