doesn't take a chef to know good food?
doesn't take a musician to know good music?
doesn't take a... person that makes gifs to know good gifs?
And it clearly doesn't take a detective to know an starfish. He does good, free work by request. If you don't like his stuff, don't bother with the topic. Personally I DO like his gifs. They don't need to be high quality considering most people will use them for maybe a month at most, then switch it.
Your right. It doesn't take a proffesional to know a good gif. But as both an artist and a musician, I don't openly put down other artists/musicians, nor behind their back for that matter. It's a richard move to insult someone like that, and even more so when your not even a patron of their field.
Let's say you were a finger painter. I could rain stuff on your work because I AM an artist. I could call it something a kinder gardener would make, or unsightly. It's entirely a matter of opinion, and yet nobody would do that, save for the real haughty starfishs.