I didn't think 'this can't be real' OP - I can easily imagine the situation.
I think a lot of posters only read/ comment on AIBU threads looking to tell someone that they ARE being unreasonable, and stupid, and 'hard work' etc. It makes them blind to any subtleties in the post, and stops them from taking a minute to think, or to empathise. There's also this weird rule that absolutely every bit of information and context has to be in the first post - rather than say asking a question to get a better sense of what happened before weighing in and telling someone they're dramatic and ridiculous. I've read all your posts OP - and with the added context of it being Japan, where being quiet is a cultural expectation, and your husband's broader anxiety about 'getting it wrong' - then what happened really doesn't seem that unbelievable.
Plus some people just have poor reading comprehensions skills and an inability to imagine situations/ relationship dynamic outside of their own experience.
There was something I identified with in your post, my DH doesn't do 'the look' so much, but he does have quite a noticeable anxiety about being noticed in public or inconveniencing anyone out in the world/ general public in even the most minor way. He's hyper aware of ever being in anyone's way - even when it's unavoidable, and if someone is walking behind us he'll be like 'watch out watch out' and almost pull me out of their way - I'm perfectly aware of when people are trying to get past me, and if ever I didn't notice then presumably that person is perfectly capable of saying 'excuse me' - so it drives me mad to be so constantly monitored and shepherded around! If we're at the zoo say, and lots of people are trying to see a particular animal, we'll wait our turn and then when there's a space I'll step forward with DD to have a look, and he'll hang back so he doesn't even get to see, looking mortified that we've dared to take up a little bit of space for half a minute, and then be like 'come on come on people are waiting'.
Just a few examples - it's a hard one to describe and individually none of them seem that big a deal - but I think it comes from a similar place as your husband. It's their own anxiety, and their own fear of taking up any space/ drawing any attention/ getting anything 'wrong' - but it gets projected onto you.
My husband has definitely improved with it - we did have an open conversation, several actually, where I explained that it makes me feel like he cares more about every single random stranger we meet out in the world, and whether they have to take two extra steps to go round us for example, than he does about my comfort, needs or feelings. It puts me on edge when we're out and it's fucking patronising too - I'm a fully functioning adult who survived in the world and managed to walk down pavements/ exist in society without incident for 30+ years before I even met him, I don't need his input now. So he's definitely chilled out a bit - but I think you have to remember that it was never about you or any of your actions. It's about him.