For now, set appropriate boundaries if your feelings are hurt when your friends act the way they do. Such as agreeing to disagree, and admonishing them that they have made their point and don't need to belabor it anymore. In the meantime, keep reading, researching, and studying up on all the various aspects of polyamory, so that if your friends (hopefully) do come to you with questions at some point, you'll have answers for them. (And at the least, you'll have some more answers for yourself.)
Being an active member on this forum is a great portal for doing all that reading/researching/studying up, by the way. Glad you're here!
Love means never having to say, "Put down that meat cleaver!"