Nerds making money and people gunna hate.
In one corner, we have sweaty alpha male jocks [+]. In the other corner, we have geeks with computers. The geeks ran the table on the jocks primarily because the geeks can do math faster. The jocks complain that the geeks are cheating, because how can they be expected to out-math a computer and, also, isn't math just a little suspicious? And HN sides with the jocks?
[+] People might think I'm exaggerating. Videos exist of the daily life of a market maker. Here's a representative day at the office, circa 2000, in Chicago's open outcry options pit: https://www.youtube.com/watch?v=mvx3xM02iUs In stocks and bonds, you generally got to be sweaty in your own office (open plan, frequently) and yell at someone over the telephone rather than straight to their face.
So it's not so much that HN has sided with the jocks over the geeks. It's that (some portion of) HN dislikes both of them. And since the geeks killed the jocks the geeks are all there is left to dislike.
Part of this is also algorithm aversion (even here on HN) - watch how people are reacting to Tesla autopilot crashes. There is a lot of tin foil stuff about 'algos gone haywire', but I can tell you now that humans fat fingering in the market were both more common and more deadly.