obviously, he thinks negative stereotypes about minorities and women apply to members of those groups. that's basic bigotry. but donnie is in for that logic completely, for any group. he's far too stupid to differentiate within groups.
new york didn't vote for him? punish new yorkers (when he pushed to limit the federal tax deduction for state and local taxes) doesn't matter to him that there are lots of republicans in new york, doesn't even matter to him that that limitation disproportionately affects richer new yorkers, who are more likely to be republican.
a few people on a small admissions committee didn't admit barron, so he wants to destroy harvard in its entirety.
maine's governor hurt his fee-fees so he froze funds for food for maine schoolchildren. because "maine" was mean to him, so he hits back at maine.
so, d-day was a bad day for germany because it was the beginning of the end for germany in the war, and he's talking to the leader of germany, so it was a bad day for germany and a bad day for him.
the concept that most of germany hated living under hitler and they were happy to be liberated from that is completely lost on him. he's far too simplistic for that.