I personally tell them about the decentralized nature and the lack of a middle man in transactions. What would BCT recommend to grab attention?
The decentralized nature is it's biggest selling point. Sadly, though, many people are not that familiar with economics or how the fiat monetary system works so they're not that bothered by it.
They don't give a fuck. I've tried explaining Bitcoin's supossed selling points to the average folk and they only start paying attention by the time I mention it can increase in value and they can win money. Other than that, they don't care because they can do everything that is needed in dollar, and 99% of people aren't wealthy enough to care about diversifying it if we are selling Bitcoin as a storage of value. So unless it becomes widely accepted everywhere and becomes a cool thing to do to pay with Bitcoin and so on.. it's doomed.
Well that's sadly what happens with most people, but like Finchy said above maybe they will live to regret not trying to understand the benefits at some point in the future. You just can't force it on people so they need to look into it themselves and if they don't there's nothing anyone can do about that, but hopefully bitcoins popularity in the future will help sway them.