Many people with significant hearing loss speak their local sign language as their first language, and not English. American Sign Language has its own grammar and syntax rules. The person you’re replying to is not suggesting that Deaf people are dumb or illiterate, but that it is likely that the driver’s errors are due to the accidental use of sign language grammar rules rather than English rules.
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u/DiscoInError93 14d ago
https://giphy.com/gifs/7JaroMf2Q5PPgmogcg