I think this is an example of when the categories of neurotypical and neurodiverse start to fall down. We create categories to put people into, but the reality is that everyone is a bit different. Like how you get some men who are more feminine than the average woman, and some women who are mre masculine than the average man. Within every broad category there are big variations. It's quite possible that this man has a genuine blind spot for social cues, even if he otherwise wouldn't fit the full criteria for an autism diagnosis.

And of course, it's quite possible that this man's behaviour irritates "neurotypicals" as much as it annoys you. The other neurotypicals won't consider his behaviour to be normal.