AI is often only trained on neurotypical cishet white men.

Can you back up this claim? Unless you're just being an assumer, or you expect people to be suckers/gullible/"chrust" you.

What happens when a community of colour is full of people who don’t have the same conversational norms as white people

In this statement alone, there are not one but two instances of a racist discourse:

1. Conflating culture (conversational norms) with race.
2. Singling out "white people", but lumping together the others under the same label ("people of colour").

You are being racist. What you're saying there boils down to "those brown people act in weird ways because they're brown". Don't.

What happens when a neurodivergent community talk to each other in a neurodivergent way? Autistic people often get called “robotic”, will the AI feel the same way and ban them as bots?

The reason why autists are often called "robotic" has to do with voice prosody. It does not apply to text.

And the very claim that you're making - that autists would write in a way that an "AI" would confuse them with bots - sounds, frankly, dehumanising and insulting towards them. And reinforcing the stereotype that they're robotic.

[From another comment] Did you write your comment with chatgpt?

Passive aggressively attacking the other poster won't help.

Odds are that you're full of good intentions writing the above, but frankly? Go pave hell back in Reddit, you're being racist and dehumanising.