There are those who readily shut other people down upon learning that they believe in something they don't agree with even if they initially looked up or respected that person for so many reasons. I also encountered this situation even with those I see as my model in life. I also felt disappointed.
But rather than looking away from them, I try to listen on why they believe the opposite. Besides, I idolized them earlier because I trusted that they know better in many things. Although it does not mean I have to agree with all that they have to say. Upon hearing their sides, the possibility is either I get enlightened with their reasons and nod in agreement to their position, or learn something from their point of view but still disagree. In both scenarios, I learn, I win, I improve.
Turning our backs and shutting our doors just because of dissenting opinions is a sure fire way not to learn a new thing about the world outside. I did that mistake a lot of times before. And I learned the lesson that I missed a lot more other lessons in doing that.