My first real comic hate was at a convention. I was just graduated from my videogame school and started to do Echo, which is the real first comic I do. A man came, we discussed a little bit, and when he heard that I was graduated from my school and wanted to continue in graphic designs, he froze and said "I'm a professional graphic designer/illustrator AND a teacher at [another videogame] school".
Then he continued to tell me that all I did was trash, that I got nothing for myself in every way : the story, the action, the drawings, the pacing, everything was really trash (I never got drawing classes, so I learned everything by myself). I remember him showing me my friends's comics on the booth and kept telling me "you see ? THIS one is PROFESSIONAL. Yours ? No, nothing.".
He told me after that I should go to better schools and spend money on them instead of wanted to find a job, because no one would hire such a drag that knows nothing. After this, he told me that he wasn't sure that the school would let me enter, given how bad I was at drawing.
He was really nice, huh. So when he walked away, I rested on my chair for 2 minutes, because he just destroyed me. Then I got up, just said some really bad words about what he said and picked up what I found interesting in his monologue, and continued my life.
So, yeah... it was the first comic hate, and I was doing this comic for merely one year or half a year, so it was really hard! But I didn't give up at comics. : )