Possibly because people like you respond with no actual information in your post that people could learn from?
I am less impressed with the defensiveness you're responding with when ignorance is pointed out than I am with the people pointing out the ignorance.
I'm not intending to be defensive (I'm sure there's loads of people on here with more knowledge about licensing terms), but usually a corrective post is something that we can learn from. Just saying something is wrong with no more info seems against the spirit of HN.