The reflexive reaction that opposing views are due to hate, and thus immoral and irrational.
Oppose illegal immigration, it isn't because you are for rule of law, but you're accused of hating immigrants.
Oppose an open door to Muslim refugees we can't vet (like the San Bernadino shooters and Somali immigrants returning to the Middle East to fight), and you're not in favor of national security but smeared as Islamophobic.
Oppose higher taxes because it hurts the economy and fosters government-big business collusion, it isn't a reasoned economic view, you're just greedy.
Oppose affirmative action policies that lead to too many minority kids getting into top schools they are not ready to attend and drop out of, wasting everyone's time and money when they might have graduated at a school at their level, get called racist.