There a really glaring result relating to when people were asked to agree/disagree with the following statement across a variety of demographics:
This group does not at all agree with my vision of American society
Atheists 39.6% 41.9%
Muslims 26.3% 45.5%
Homosexuals 22.6% 29.4%
Conservative Christians 13.5% 26.6%
Recent immigrants 12.5% 25.6%
Hispanics 7.6% 17.1%
Jews 7.4% 17.6%
Asian Americans 7.0% 16.4%
African Americans 4.6% 16.9%
Spiritual, but not religious — 12.0%
Whites 2.2% 10.2%
First number is from 2003.
All of the numbers have increased. Some by quite a lot. Even white people, who are totally awesome and chill, went from 2.2% to 10.2%. Disagreement with conservative Christians nearly doubled to 26.6%. The previous study was not long after 9/11, but disagreement with Muslims jumped from 26.3% to 45.5%. Immigrants doubled. Hispanics, Jews, Asians, African Americans... all jump from single digits to double digits.
This is what polarization and demonization look like.