Although you are correct in saying that the comment was hostile and condescending. I'm sure the poster meant it to be as such for many possible reasons none of which I will try to guess.
Stating that someone has "incomplete experience" is hostile, as opposed to informative? The statement was meant to tweak natural curiosity. Apparently, I'm supposed to stroke everyone's ego so that they feel perfect, otherwise I'm called "hostile."
Although you are correct in saying that the comment was hostile and condescending. I'm sure the poster meant it to be as such for many possible reasons none of which I will try to guess.