Don't let it get you down. Instead of getting discouraged at how many people don't understand Bitcoin, be encouraged that you've found a community of people who do. Focus on the positive, look at all the great stuff being built on Bitcoin, and realize that it's easier than ever to buy stuff and transact with Bitcoin.

If you have truth on your side, you'll eventually win, though it may not look like it for a long time. Just keep plugging away at it.