I'd go. It's about the skids. It's not about the sh*thead who gave sperm. If you wish to see the skids then go. If not, don't go. Just LOOK GOOD when you go.
I remember many times when I had to see H's ex. I made sure I looked FINE when I walked through those doors. Held my head up and smiled as if I owned the world. My outward confidence up against her hateful nastiness made her FLEE! Then I would go home and do the Pee pee dance. I mean it, hands overhead, "Go Beauty, Go Beauty, Go, go, go, go, ......" OK, there's a bit of twisting knife in back but I earned it to even have to see the wretched troll. LOL
Take the Bozo out of the equation and make your decision from there.