Hey, don't let one or two neutral or negative comments color your day. There are many other positive ones.
Trouble is, when you put yourself out there, you are opening up yourself to an opinion by others, no matter what the topic. We all have them and some are more apt to express them than others. You know of people who would never give a negative opinion EVER and then some always have them and then some and in the middle.
When you have busted your butt and you as the expert know how much time it took and the expertise used, then pat yourself on the back knowing that 99% of us could never have done what you did!!! Thanks for everything.