Spoiler
I'm definitely okay with going first! I haven't seen it before and don't really have a chance to right now, but I've come up with a good solution for getting around my lack of knowledge. 
The moment the movie started, Tim felt a pit of dread form in his stomach. He shrunk back in his seat, running his fingers through his hair as the characters began to appear on the screen. None of it was like what Gotham was really like - or what the mansion was really like - but that wasn't the real reason for his reaction. He just couldn't get over how mortifying it was to see Batman and Robin on screen, even when Robin was James and not him.
About a minute in, he hid his face behind his hands. He tried his best to keep his composure, but he couldn't stop the blush from spreading across his face.

