I don't have a problem with opinions that are not based on peer-reviewed, replicated, statistically-rigorous science (not that there's any other kind of it). What I do have a problem with are opinions expressed as if they were scientific opinions, but are in fact thinly-veiled prejudices.

If someone claimed Jews are formed as thieves by their culture because he knows a guy from San Diego whose Jewish clients are always behind on their payment, he'd rightfully be labeled not only as racist, but also as stupid, and with good reason. I see no reason to treat someone who claims, as a proof that people born in a certain period of time are more egotistic than others, the fact that an accountant told him so, any differently. That's not only as insulting as racist pseudo-science, it's as idiotic as racist pseudoscience.

There is probably sufficient truth to find among those as well, perhaps, but in my opinion, it's intellectually lazy.