You're taking a kernel of an important idea and exaggerating it beyond reason. Yes, everyone should consider how they would react if people they support behave badly or if their circumstances were different. I don't think it's presumptuous to say I would not support Obama if he said and did the things Trump has done. Am I more vigilant about the wrongs of Republicans I disagree with than Democrats whose aspirations I share? Probably.
Might I have different views if I were raised in a red state? I don't doubt it. But I have trouble seeing a version of myself who doesn't see the danger in vilifying people because of their race or calling the media the enemies of the people.
Open-mindedness is good until you insist it should wipe out even the potential for accountability.
And Peejaye, there is something both voyeuristic and childish about refusing to engage in conversation and continuing to downrate innocuous posts long after you've had a chance to cool down.