Is there a reason men without friends or hobbies are seen as a redflag?

I swear to god this isn't a troll question but over the last year I've really tried to self-analyze why I struggle with even attracting anyone outside of the reality of being unattractive. I've had Redditors of both sexes say that it's a red flag to have no hobbies and women on Twitter talk about no friends being a red flag in men they're interested in.

I just don't understand why. From my point of view, that would mean I'd be more open to doing /eating/going wherever when we hang out. Having friends as an adult is hard and even moreso if you had none as a kid. Am I just that socially obtuse? Thanks