I agree with so many folks on this thread- your friend is pushing one set of social queues that they abide by, but that isn't everyone.
I think this has more to do with communication over text, as there are NO physical cues to help gauge tone. I'm not autistic, however when texting I've learned to practice mirroring for each person I chat with. If I notice they end their sentences without punctuation, I'll adopt that. If I notice more emojis, I'll have fun with that, or hold off if it seems that they don't use them.
A big one for me is using "!". I usually will use "!" to signal excitement/ friendly tone, however I've learned some people see it as an angry tone and thought I was freaking out about what they said.
When I talked to my therapist, he noted with his clients that 90% of disputes start over social media/ texting. I almost lost a friend when they sent me a lecture from a professor talking about the Israeli/ Palestine conflict. A few days later I saw a funny music composition video titled "old MacDonald had a lobotomy". I thought I was just sending a funny video, but she thought it was in response to her video, and I got a stern text that I had to clear up.