I have seen people express how weird they find people wanting to eat alone occasionally throughout my life, and even had some volunteer to eat with me "so I wouldn't be alone". When I say that I wanted to eat alone, they expressed genuine concern that it is weird to not want company. If I let them sit and talk then they feel good about themselves and leave me alone for a bit.

Honestly the pressure I got from being pestered about eating alone ended with me just eating lunch at my desk and I absolutely love work from home. Going out with coworkers once a month was plenty. They are fun and all, but most times I just want eating to be when I take a break from other people.