Tessa, You probably know this already but I will say it anyway.
The intelligent hobbyist can discern good information sources from bad.
The intelligent hobbyist knows from the information on this board that you are a quality experience.
The intelligent hobbyist knows that little Jonny is to be ignored completely.
I am sorry that your profession is one where at times you feel compelled to respond to the little Jonnies of the world. I also understand why you did, and quite eloquently at that, but believe me, even if you had not, the type of intelligent hobbyist I expect you are looking for as a client would not have been dissuaded one iota by the rantings of little Jonny.