I love that he doesn’t even have any coherent reason for disliking it aside from the fact that it’s incompatible with his absurd fantasy world.
This is his thought process:
"Oh no, they changed the thing I like! I hate this! Hopefully everyone else hates it too and this goes away by itself!"
"Oh no, everyone likes this change! I need to make them hate it! Hmm, but how? I don't have a reason!"
Then he'll look for anything at all to justify it. Blarms was particularly funny because there absolutely was no reason to dislike that. But fortunately for Chris, someone actually threw him a bone and said "huh, kind of reminds me of G3, didn't like that gen too much."
Now Chris has a reason! Someone unintentionally told him why he should hate it, so he didn't have to think of one himself! He religiously ingrains this new information into himself, finally he has something he can tell to himself and others that there's a good reason to not like this change! And then he'll preach about it harder than a Jehovah's witness in a desperate attempt at forcing this change to not happen.
And he tells himself he isn't autistic anymore.
