13 y/o son benched by coach and I’m the assistant coach

My son plays AB (advanced baseball) glorified rec ball and I’m the assistant coach. My son is not the superstar bit he plays hard doesn’t complain gets on base at almost 50% clip and has a positive attitude the past weekend we drove an hour away to play a double header and the main coach wanted to just bat 9 and didn’t start my son and just gave him 1 pinch hit at bat for each game. I want to have a conversation with him should I bring it up at our next practice or text him and follow up with a face to face discussion?