The first sentence in his paragraph isn’t some grand spoiler that’ll no doubt ruin it for someone.
For some it would. Stop projecting.
SPOILERZ
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.I wouldn’t believe it if someone said their experience in the film was ruined because they knew beforehand that there isn’t a scene where they get to see two animated characters do it. This is a Batman movie. I don’t think anyone wants to watch cartoons do it in a Batman movie, let alone be heartbroken if they don’t get to see it.
It has been like 3 years since I read The Killing Joke but I don’t remember Batman and you know who kissing so assuming that is something that didn’t happen in the original Graphic Novel that’s a huge thing. That can definitely have an effect on someone’s viewing experience. Especially someone who is into Batman more than you and I.