Personally, if I'm in a coffee shop or any store with some people, I pull out my wallet and subtly show them my Xapo debit card. Then they get curious on what kind of card is that since it doesnt look like the usual Mastercard or creditcard. Then I explain it from there on.
What's your way of spreading Bitcoin knowledge?

My relatives do not care about my participation in Bitcoin, but they want to know how much money I earn. I often think that if my country does not prohibit Bitcoin there will be a lot of people in Bitcoin who are involved in the country and this will make the country more prosperous.