Sorry, One Direction fans ... a reunion seems ever less likely to happen -- because a new report claims Zayn Malik slugged Louis Tomlinson . The Sun laid out the alleged altercation in an article posted late Friday ... claiming the fight went down during the filming of a new Netflix reality show which was supposed to focus on the pair bonding on a road trip. The outlet says sources told them the fight was triggered when Malik made a crack about Tomlinson's mom ... who died of cancer in 2016 --