There's a place for it. Namely, the email of whoever wrote the piece. Not a discussion site. Spamming complaints on HN only serves to lower the quality of discussion.

The point is that ranting about it here can't directly fix the problem. Sure, it can keep the topic of accessible/usable web development in people's minds, but it likely already is for most web developers using this site. Where a specific page/site is concerned, the person to complain to is the operator of the site hosting the relevant content - i.e., the person/group who can actually do something about it.