Former School board member here.   I think you could just let it go... since the coach has  apologised.      Or if the coach is not the athletic director  maybe say something to the AD.   Maybe  something to the affect of:   I'm not filing a formal complaint  but,  I don't want something like this happening all the time.       It is very likely  that there have been other complaints in the past.    An informal sit down between the coach and the AD  could be a good thing.