Making fun of your ex’s new gf is gross behavior and reeks of insecurity and jealousy. Unless he cheated on you w/ her and SHE KNEW y’all were dating, leave her alone bc she didn’t do anything to you.
Yay that happened to me! (Both of them cheated while in a relationship) but that shows more about who they are as people than what they look like. Looks are not an indicator of morality