I totally get what you mean, OP, and I don't get why you're getting such a hard time. I'm in a similar boat and I feel completely suffocated.
I've always worked at home because I freelance. My husband used to work in an office, and has only been working at home since the pandemic, and it's looking like it's going to be a permanent thing. We have separate offices and I keep my door shut, but I can hear his voice droning through the wall, can hear his feet stomping round the house - I'm just so aware of this constant presence. He likes us to have lunch together, which he spends moaning about his job, and he carries on the moaning over our evening meal.
And it's not just that he works at home: I am literally never ever alone in the house. He has no friends and no interests. He just watches TV all the time, and never goes anywhere. I have lots of friends and interests that take me out of the house, but I am also an introvert and I crave time in the house completely alone, without being aware of his constant presence in the house and being able to hear him tutting or sighing or stomping. If I have a door shut, he will always, without fail, find a reason to come into the room I'm in and then he leaves the door wide open when he goes back out. It feels deliberate - like I'm not allowed my own space and I have to be alert to him all the time.
Because I freelance, I'm fortunate that I can sometimes choose to take an afternoon off here and there, but now there is zero point to me doing this because it requires me tiptoeing around my own home and also keeping the dogs quiet because he's still working. If one of the dogs barks, he comes rushing out of his office to frown at me and snap 'what's going on?'
Another example: say the wifi is slow for example, he will bang into my room, frowning and demanding 'what are you streaming? Stop it immediately, I can't work' - like he thinks he's the boss of me or something - even though I'm never ever streaming anything.
I don't want to have friends over, because again, he's just 'there', wandering in and out, and neither my friends nor I can relax and have a good chat. It's the same when I'm on the phone - I feel on edge when I know he can hear me - not because I've anything to hide, but because I just want a silly chat with friends in private - but he's always telling me to take calls with him in the room and doesn't see the issue.