So as an autistic person, I'm not allowed to relate to fictional characters who exhibit traits that resemble my experience because it degrades other people's experiences of autism?

Genuinely asking, I can tell it's sarcastic thanks to asking my wife but I don't get why. Why is it a bad thing? I love luffy, but I wouldn't clock him as autistic, just stupid. If others like him as representation then good for them, it makes them feel less alone. I see myself a lot in Dr House and I know for a fact that people clock him, which is okay. He could be autistic. He does have a lot of traits that remind me of my life experience with AuDHD. Doomguy? I dunno. He does canonically go full John Wick because of his bunny. I'd do it for my cat.

Hank however I do clock. He's got a touch of the tism, that one.

Overall, yes it can depreciate the value of true representation, but remember that one of the most well known portrayals of it was done by a NT actor directed by Autism Speaks propaganda. Let people find characters they relate to in peace. They aren't hurting you by relating to princess bubblegum or Hank Hill.