I more often get the "Well, if it works for you..." but done in such a dismissive tone that's it's one of those "I don't agree with it, but I don't want to know any more about it, so please stop talking about it." It feels sort of passive-aggressive to me.
I have had a few people be rather negative, but once they see that it is a natural part of my life, and that it's not going to go away, they often adjust their thinking process.
The best way to prove that it can work is not to try to convince them it will, but to *show* then it will. The best way to prove that you're not going to grow out of it is not to. Unless it's really important to you that these people do something to support you, just leave it be and get on with life.
"Listen, or your tongue will make you deaf." - Native American Proverb