As a web newb, can you explain why the things in this comment are wrong and downvoted?
Yes, down votes can express disagreement. More often they represent a misunderstanding - rewriting a post can fix this - or they represent a conflict with community guidelines/standards - rewriting can also fix this. Sometimes the best edits are deletions.
It's the tone, particularly the opening line that is likely to cause downvoting of your post. It's demeaning and PHP trolling and unsubstantiated, and therefore, poorly written for HN. The technical discussion which follows, though fine, can't fix it.
Good luck.