Mother-In-Law Makes Dad's Daughter Cry, Gets Banned From Christmas

This dad asked the people of Reddit whether or not he was in the wrong for cutting his mother-in-law out of Christmas, after he hit his breaking point with her. It sounds like she's a toxic drama-stirring, upstaging mess. Might be best for the kids to not have that kind of person around, come the holidays? Or is he overstepping?