At the time you came out to your parents, who accepted it better? This is only at the initial announcement and not after any processing time.
I am a bisexual woman who has been in a 12-year+ relationship with another woman, out to all family etc. A few years previous to that, I told my mother and father I was bisexual. Like Datalounge, they didn't believe it existed. Guess what, 20 years later, now single, and I am still bisexual. My parents now believe in it.