I told every one from the beginning, and was open about when I started my studio. I have received many "threats" and angry words on FB from "fundamentalist christians" who are friends with my BF, and I try very hard to ignore them. I have given up trying to educate them as some people are too stubborn to change their mind.
I thought I had the support of my mother, but I only recently found out after years of poling and more recently teaching, that she really wasn't that happy with it. It didn't help that my aunt had been making comments and twisting FB status' and my mom never contacted me about it.
So I sat her down one day and showed her videos from the 2010 world champs, also pointing out moves I can do etc. I think it gave her a better idea that I'm not stripping and it is more fitness, but i don't think she will ever be comfortable because I left it so long to show her. My dad is great, ignores the actual poling, but discusses business quite happily with me all the time.