Secondly: How much can we, historically or theoretically, attribute a growing resentment towards the Native Americans [post-war] due to their popular allegiances with the British (and their "war crimes").
And I'd just like to add some rhetorical thoughts: a) I'm still dumbfounded as to how the Patriots fought so well, and b) imagine the world today if the British had won..
I wrote this comment the other day that answers part of your question.
A lot of Loyalists had their land confiscated by the U.S. government. The British still controlled Canada, so they offered as payment to the Loyalists free land on the Canadian frontier.
The numbers vary on how many Loyalists actually went, but at least 40,000 did. The direct result of this is that part of what was originally Quebec was settled primarily by English-speaking ex-Americans, and this is the part that became Ontario. Before that, Ontario was sparsely populated, and mostly by French speakers.
Many more stayed put in the United States. Census, tax, and land records show it was not uncommon for Loyalists to end up living on a relative's farm, such as with a parent, aunt, uncle, or sibling, after losing their farm through "land bounty rights".
Others moved out to the American western frontier, though I do not have any specific numbers on how many did so. It was more common to go to Canada or elsewhere in British North America, such as the Bahamas or the Caribbean.
b) imagine the world today if the British had won..
Well, we can never know because it didn't happen, but it's not outside the realm of possibility that the U.S. would be a lot more like Canada. Canada was granted self-rule in the mid-1800s, about eighty years after the Revolution, and had been founded in large part by the post-war Loyalists whose children and grandchildren went on to fight for Canada on the British side of the War of 1812.