I’m a bloke, my opinion is he is boring, completely and utterly tediously boring. When people used to go to pubs, they were called pub bores - the Fast Show had a whole character based on one in the Nineties.
He is not autistic, he is not on the spectrum he is just a boring bloke and they are everywhere. Nobody wants to hang out with them, male or female - 99.9% of men like this do not fit any existing criteria for any autism spectrum disorder, we have to stop making excuses for blokes who can’t be bothered to learn and adopt basic social skills ffs - its a get out card for being lazy and boring and not taking interest in other people.
We are social animals all of us, we need social interaction to survive. Does he know he is boring, of course he does! He is a fully grown adult, he can change, every single human has the ability to change - they just can’t be bothered because they’ve never had to or been challenged to.
Believe me other men call men out for this all the time, at work, in the pub - and some blokes change. Some blokes have to because the changing nature of most jobs demands communication and social skills. But some just don’t change and can’t cope or leave, I think they must seek each other out in places where they can continue as they are.
The thing is, its very likely to be cultural- but its not a happy place to inhabit, to not have real connections with others and not enjoy a full life that simply investing in some skills to navigate life - and they are skills, most have them naturally but they can be learnt. It’s lonely, unfulfilling and sad and it is a self fulfilling prophecy - but change has to start with number one, he has too see the need to change and want it. You are not asking for the world, a quick google search will return three ways to speak to anyone in any environment- i learnt from my Mum at an early age (not my Dad he was boring as fuck, I vowed not to be lime that - my mum was hilarious and smart) three questions to ask anyone, where did you go to school, have you been on holiday, how are your family simply because most people went to a school, have family and most have been on some sort of holiday - its basic but if you can’t be bothered to even do that then fucking hell.
Ask him to change, explain why you want him to change, that the world is an amazing place if you join in. If he doesn’t, get rid, life's too short, you both deserve the best lives you can have, to be fulfilled and engaged with each other - to enjoy the circus that life is. Each and every single one of us is going to die, don’t waste more time.