If you watch the replay from the opposite baseline cam, it's clear that Maker is looking up at the hoop and the ball. In other words it was just an over zealous attempt at boxing out.
And Maker was holding prior to that as Jefferson made his way through the lane. So, two fouls on Maker there. But point is, Jefferson escalated it with AM obvious shove, without looking at the ball or anything. Gotta agree with the OP,Jefferson is an embarrassment, if you can't handle aggressive D late in a game then maybe you should've stayed retired and gone off to drink cocktails on a Florida beach instead of staying in the big league!