i need parents options about kids and sports?

When my son was 5 I sign him up to tball and mid way he wanted to quit but I told him needs to finish wat he start and then he said he wants to do flag football when he was 6 years old he loved it the coach told me he has talent that he has hand to catch and alot of speed, so I sign him up to flag football at 7 years old and I told him to be the best you need to work hard but he told me couple time I shouldnt wrry he has the talent, so the coach loved my som he is 4 , 10 he can be most 12 years in a race n he can catch but every time his mom would take him to the practice he would slack and do watever, so then he went on vacation for week he missed four days of practice and the game, he started cry to his mom told her he dont want to do it no more n etc.

Me and his mom got in a argument about quitting stuff and she was like if he wants to quit in the middle of it he can its just a sport and I believe thats wrong cuz that showing that if you start something its ok to quit

AM I right ????