validatenfreude
A mixture of emotions consisting of equal parts validation and schadenfreude.

Most generally felt when someone else calls your ex an asshole on public forums such as Twitter or Facebook.
I felt kinda bitchy when I saw that tweet about him\her being an asshole\cunt and all the retweets and replies of agreement, until someone pointed out I wasn't being bitchy, it was just validatenfreude. It felt so good to know that it wasn't just me, but that everyone else thinks s\he's an asshole too! Hahahahaha! ISTBY! Comeuppance is a bitch, ain't it, fuckface?