JavaScript is a pretty popular language. Also HN is a slice of the developer community at large. I think anything that discusses JS is going to look pro-JS to a person that hates it.
I don't think parent will find any high traffic developer discussion forum where people don't discuss JavaScript.
I admit I don't like the language, but there's definitely both camps on this site, seemingly in similar proportions.
Seems every thread about something built in javascript is full of people bashing it.