On HN, the disparagement tends to start with "Good, <sector> deserves to be disrupted" and continues with anecdotes and stereotypes.

I hear techies disparage the industries they're trying to disrupt all the time. There's a certain "schadenfreude" that some people have for the industries that tech disrupts. I don't have any evidence for you off-hand but this is so incredibly common in my start-up experience that I hope you'll understand that even if you don't think so, lots of people do.