My parents are semi-skeptical about the whole notion. My dad accepts it more than my mum. He saw a program about casino cheats, which included counters, so he kind of thought from that point onwards that if casinos attempted to eject counters, it must have been for a reason. They were winning. So I sat down with him for about 30 minutes and went over how BJ can be beaten, and reassured him that it wasn't cheating at all. So now he doesn't question me anymore, but he does like to look at my win/loss sheet from time to time and point out the red sessions. Variance is a thing many people don't understand. He will often ask, "So if you're counting, why did you lose $xxxx this night?"
My mum understands it even less so, I don't bother explaining anything to her. All she says is "no one has ever become rich from going to a casino or playing poker (I play that, also)". I could rattle off names from both the BJ and poker worlds, but I don't think it would register with her. They're European, they'd be prouder of me if I made $1000 a week working my ass off in a factory, than $2000 a week playing BJ, hypothetically speaking. I don't understand their logic at times.
I introduced the game to several friends of mine, at a friend's house, and their parents were even worse than mine! I could have presented an entire 2 hour presentation on the subject, but all they could say at the end of the night is that it was gambling. No one beats the casino, no one. They weren't the least bit interested in anything I had to say, and thought I was attempting to rationalise myself as a hopeless gambler.
Moral of the story is, some people get it, some don't.