He is an evolutionary biologist, so he should make what he knows about evolutionary biology available. Tell people about it, write books, grant interviews, attend conferences and seminars and host talks about his ideas. But show some respect.

At the end of the day, no matter how loopy or wacky a persons beliefs are, they deserve respect. There is just no need to go around calling people "idiots" or telling them to "fk off" if they don't want to take on his world view.