That’s true. I would probably have dismissed you for not having regular working hours and being away a lot. (If that’s the case with you. I would have asked about it, of course)
Labelling is a big problem and I try to stay away from it as much as possible, but it’s very human, so it takes effort and practice to stop putting people in boxes.
I do understand your frustration, however. It sucks to be dismissed this quickly, but it’s usually less about you and more about them. What sucks isn’t really to be dismissed, it’s that there so few people out there who are willing to look below the surface. I hope you’ll meet some of the few people who are.