Dismissing facts, evidence and proof they will stand firm. The same things one team says about the other who holds the top position, is then repeated the next cycle the tables turn...God forbid you mis-speak or mispronounce a word or something, the opposition criticize, in complete ignorance of how they reacted when their guy was in.
I understand bias, we all are biased. We also don't all agree on policy or principals...even passionately but most of this shit is all just that...it's bullshit. It's religious garbage of finding everything bad about the other people or finding any way to twist things into being bad while your team is virtuous.