There should be a rule: When a batter is running to first, you can stop if you want and make a fielder come to you, but you can’t go backwards. There is no safe base behind you, so that play is really dumb on multiple levels.
I'd respect the Sox if they made an announcement now;; Due to expected inclement weather Thursday and Friday night, both games will be made up July 22 as a straight doubleheader....etc." They know it's going to suck.