You play out in public, whether at a concert or on the internet, you will NEVER be able to hear or read everything said about you.

How is this any different..?

You go to a concert, see an act, then talk about it afterwards, perhaps critically. Do you feel guilty for 'talking behind his back' doing that? Of course you don't!

This is pretty ridiculous, spalding.

The mere act of performing in public is an INVITATION to criticism or praise. If you want to remain in control of what anyone can say about your playing, don't ever let them hear you play! That's the only way you can do it.

Do you have anything up anywhere for all to hear? If so, did you do it in the expectation that you would remain in control of what others think of it? I doubt it.