That stinks ENGINEER-JOE, and you are probably right about the brain cells. It is unfortunate that some people can't differentiate between constructive criticism, opinions, and downright rudeness. As many great elders have said(whether mom, dad, grandparents, etc.), "if you don't have nothing nice to say, don't say anything."
Everyone has probably met one of these types, and it is annoying when they just won't keep their heckling(or whatever you want to call it) to themselves. Never let them deter you from what you want to accomplish.
I just wish I had the modeling skills to do these things(time would be nice too). Maybe one day I'll get there and be able to post some nice things like this that I would build on my own from scratch.