When I'm at work... Idk some days I would love to just be assigned to a one person job away from everyone else. (Antisocial days... I guess) Mostly I'm bothered when coworkers are making plans to hang out outside of work right in front of me... People I thought I'd been getting along with, sharing common interests, having interesting discussions... For years. And yet, I'm never invited to spend time with them outside of work. Or when you share contact information with someone you thought you were friends with and they never message you. (Twice that happened, one quit, not because of me, and the other is on a different shift, I was on it too while I was in school) It makes me feel like I'm just something they have to tolerate while they're there.
Though I suppose socializing outside of work backfires sometimes. There was a group of girls who would go out drinking every weekend, and it never failed... Every week they would bring in some fresh drama to spread around, usually putting one of them on the outs with the rest of the group. Some idiots never get out of that high school clique mindset.
When my dad retired from the same factory, there were people asking about him for quite a while, some still do occasionally... Some are just nosy (people love to gossip) but I know some actually thought of him as a friend. He'll never talk to them again unless he randomly runs into them somewhere... Was the same with his other job. People he knew for 30+ years and they might as well be strangers now. Maybe some relationships just can't ever go past the acquaintance stage.