G.H.
I don't see anything wrong with the ex's requests/demands. I didn't want my ex's, now wife, at any of my daughters functions (until they were married). And she is a hair dresser & I did not want her cutting my kids hair. As far as the brushing, well maybe the kid complained & momma bear came to the rescue, who knows but it really isn't a big deal.
If he is truly great (which keeping the peace with an ex really says something good about his character) then keep him & go along with her nonsense UNTIL he marries you, then you should be allowed to go to the games just don't brush the hair, lol.
Just think about how much hell everyone's life would be if he pushed back & went against everything she requested. You would be on here about how miserable you are & asking if you should throw in the towel to get away from the mass chaos. Best wishes