>I'm pretty sure it is accurate for some subset of the driving population, which was the claim.
It might be true, but that's not the same as "accurate". Let's imagine the same thing but for cyclists:
"I saw a cyclist run a red light and I had to brake to avoid T-boning him. Apparently some cyclists hate motorists and want inconvenience them as much as possible."
I'm sure there's probably "some" radical cyclists that utterly despise motorists (think /r/fuckcars) and want to go out of their to inconvenience them, but only mentioning that as a possible reason for the behavior is at best an act of omission. There's probably some far more innocuous explanation out there, like that the cyclist thought the way was clear (because there were no cars in sight).
>You didn't actually provide any evidence or argument to dispute that claim and completely ignored the key "risky" part of comment.
It's totally fair game to criticize one aspect of a comment even if you agree with the point broadly. For instance, I might not like what facebook's privacy record, but still object to comments that claim that facebook is bad for privacy because it's surreptitiously listening on people's phones.