First of all, we are all in this hobby together. The providers make up one part and the hobbyists the other. There is ALWAYS a way to be respectful. Sometimes it does hurt to be honest but it is your hobby and you do have the right to say something.
If you aren't feeling it then you aren't feeling it... You can always say something along the lines of "I have to be honest I'm just not feeling it... I mean you no disrespect, however I choose to for go this appointment..." When in doubt be respectful and say how you feel.
We providers that are accurate and live up to our personal standards deserve the honesty from our hobbyists. As do those whom are less than honest. Please help those of us whom are honest such as yourself, and speak your mind.
I hope you have a better experience next time!