Okay, maybe if your body is super-stretchy we care and we'll even pay to watch, like in Cirque de Soleil. But in general, no one really gives a ____ how stretchy you are. Chances are we won't even find out how stretchy (or not) you are because we aren't doing yoga together.
Today someone who was in the room I would be teaching in told me in response to me suggesting he stick around for our yoga class, "my body doesn't stretch that way." Aaargh!
Let me say this again, it doesn't matter how stretchy you are. If you breathing, you can do yoga.