I think that was a little harsh. Veronica already admitted that it was likely he just never noticed her before (rather than him being a snob). I think her comment was more of a general observation. I know I say good morning to a lot of people and never get a response. Which doesn't necessarily mean they're snobs, but with some people you just get a sense and it can feel that they are.
Another definition of snob for me? People zipping along on the bike path, dodging pedestrians and cyclists, totally disregarding the safety of others because they think they have the right of way since they're faster. Do I judge those people? Of course!