I know I can not change someone else's mind. I'm not arrogant enough to assume I am the ultimate arbiter of truth. You have to decide which is more important,

I know I can not change someone else's mind. I'm not arrogant enough to assume I am the ultimate arbiter of truth. You have to decide which is more important, the friendship, or being "right". I strongly advise you to keep the friendship, and let the matter rest. Otherwise you will find yourself in an echo chamber of only friends that agree with you. Please consider that you might change your own opinion on this matter at some point.