"I refuse to sit here and be verbally abused." Then get up and leave.
^This. Repeat this phrase & action in your head over and over so you don't freeze up or back down in the moment. No big lectures or debates or fights - concise statement then simply walk away.
Me:39 Ex-W:37 M:7 T: 9 S:6 D:3 BD/IHS/Confirm EA/PA: Feb '20 OM1 affair ends: May '20 W/OM2 & moves out: June-July '20 W files for D: Jul20 OM2 confirmed: 9/2020 Divorced: May '21