Somebody talk to a friend that has no affiliation with cars (but knows enough to know what a miata is) and ask them this question. I think being car enthusiasts we can appreciate one for its performance capabilities and what you get for your money... so the poll results are probably far from real world.
Then again, people that aren't into cars probably don't care what kind of car you drive and wouldn't think you're gay in any case. Just how most of us wouldn't think someone is gay for having blue shoes, but someone that is into shoes would think otherwise (horrible example, but you get it).