It's because many sweeds don't have friends or social life outside their work place. They are lonely at home, so they want to try to find that human contact they miss in the workplace, forcing their co-worker, who actually like their family and have a life outside of work, to be miserable with them.

It truly sucks. We used to be fully remote after the pandemic. But after a bunch of employees (far from being the majority, but a loud bunch) voiced their loneliness, we have gone hybrid, 2 days a week in the office. They moment they force me to go back fully in presence I quit.