I agree with FIB...your husband maybe felt like he looked "less than a man" with you doing the deed for your son instead of him...but then again, he may have been having issues...I know this one too...my H will avoid confrontation and most cases I do also, buy like you there are times and situations where I find it hard not to stand up and be heard...
Maybe next time, if it happens, you might just mention before the game that if your son doesn't get to play much you want for you both to talk to the coach...then add if he isn't comfortable doing that you are because your son is involved and that is just what a mother will do...but tell him you would like him to be with you atleast...united front!
