Social media, plugging own merchandise, creating daft celebrations 24/7 etc. Basically living the dream life of a 14yo boy.
Though it's unsavoury for many fans to see players constantly arsing about on social media when we're not performing on the pitch I don't think it necessarily hampers a player's development. Despite various criticism for failing to concentrate on his football Lingard had a pretty fine season last year, including a good WC. I think there is a combination of factors at play in Rashford's setback, with social media larking (which in any case I feel is mostly positive as it shows good relations between teammates) at most being one part of the mix.
Rashford is a pretty normal 20 year old. He isn’t really that much like Lingard in terms of personality. They’re just friends.
I agree, it can be irritating to see daft videos from players when the performances on the pitch are vastly below par but I see a bit of lightheartedness on social media as a net positive overall, with many modern players showing they can have that and silly goal celebrations while delivering in games at the same time.