Try inform. If not possible, let it go. At the end of the day, it's their loss and not mine. I'm more than happy to help people find wealth, and uphold my responsibility of trying to inform them, but there is no need for me to put up with constant objection.
I believe this is a healthy way of handling your environment. Keep negativity outside your bubble. Only keep close to you people who give you the ambition and optimism to continue. Not sure how many of you believe in this. But manifesting negativity has always brought negative outcome in my life. Surrounding myself by positive thoughts and positive people has brought a strong source of light all the time.
I don't think difference in opinion should determine your friendships. If the basis of your friendships is whether or not they believe in Bitcoin, you might lose some friends that otherwise may have been good ones. Or losing long term friends for a silly reason.
Avoiding negativity I can agree with. Just like religion, we should not judge based on belief/disbelief in Bitcoin.