Okay, first of all, throwing a ball back on the field is dumb. Give it to a kid if you don't want it. Two, ripping it from someone else's hands and throwing it back is inexcusable. Truly awful.
UPDATE: Via Yahoo Sports' Jeff Passan (with three different fan sources), the fan in question was also hurling racial taunts throughout the game, including yelling, "bye Trayvon," to a black Tigers fan while being ejected. So ripping the ball from a woman's hands, racism and ejection from ballpark -- it's the bad fan triple crown.
(GIF via Buzzfeed Sports)