Husbands grandmother mad because I called MIL a sack of shit

My husband has chose to cut his mom off. He suffered a severe beating disorder that had him on the brick if death. He went from over exercising, to abusing laxatives and barely eating. He spent a year away from me and his kids in a facility to get better. He's healthy. So much healthier. His mom has been saying that he's fat and he looked better when he was so thin he was dying. She did the same when his sister was sober. Told her she was more fun in drugs. So his sister is back on meth. She has continued to belittle my husband about his weight so I called her a sack of shit and told her to leave my family alone. And of course her mother comes to the rescue. She called me a horrible daughter in law and he's her daughter's son and I'm trying to drive a wedge between the family.