Autism acceptance includes accepting all autistic manners of communication.
That means supporting autistic people who talk in a "very childish" way. (I do this a lot irl)
Autistic people who do "TV talking" (this means talking like a character from your favorite media,basically talking in quotes and copying their speech patterns,as far as I know)
Autistic people who use echolia.
Autistic people who are very awkward/quirky when they communicate.
Autistic people who are overly technical,or have very sophisticated and articulate speech.
Autistic people who mumble.
Autistic people who talk really fast.
Autistic people who can't control their tone of voice/inflection.
Autistic people who talk in a monotone voice.
Autistic people who use different kind of sounds,or body language to communicate.
Autistic people who talk slowly and draw out their syllables.
Autistic people who use a lot of sentance fillers.
Autistic people who use Aac devices,communication cards,etc etc.
Edit: acceptance of nonverbal autistics is also necessary. Nonverbal people deserve love,respect,acceptance,accommodation and support.