The kid was 100% correct. It doesn’t matter who says it – if it is true then be Mekabel. Adults get insulted when a kid gives them Mussar? Why? One reason – ga’avah. I am pretty sure that this guy who “happened to HAVE to check his phone” would have had the exact same response to any adult who told him to put it away. Smart phones are a sickness and their addiction is bad. Admit it and get help.