How I handle criticisms. I listen to the person and try to understand what the message is. I improve myself on it AND if the opportunity presents, I MAKE MONEY OUT OF THE CRITICISM. It worked well for me.
Of course, there are some nay sayers out there that just wants to bring my world down. In that situation, I either ignore it or get my revenge in a different manner (like file a lawsuit??)
And just continue on….