Seriously, here's a thought...has anyone sitemailed the guy, asking what, exactly, it is about your work he doesn't like?  From my POV, he doesn't actually seem to be trying to insult you or your work.  He seems more like he's challenging you.  If you're unwilling to take him up on the challenge, let him know!  It's not like you have to conform to the viewing preferences of your audience.  YOU  are the artist.  Create what you want.  But, if you don't like the critique you get, it's up to YOU to let the person know.  We step in when it's REAL trolling.  This guy...might seem a bit angsty, but he's actually stated in a previous comment on your work, originalkitten, that he seeks to help you improve your work, not cut you down.  My advice is to talk to the guy, see what exactly it is that he sees is the point in the harsh critiques, and maybe even get into a dialog about this. 

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Knowledge is knowing a tomato is a fruit. Wisdom is not putting it into a fruit salad.