I don't think Canadians are generally hostile to Americans unless they prove themselves to be asshole Americans. Lots of Canadians have American friends and would regularly travel over the border until a couple of months ago. And I think most Canadians can see what's going on in the USA and understand that some people may need to flee.
However, immigration to Canada isn't automatically allowed so it's worth doing a bit of research and planning. Here are some government web pages that may help:
https://ircc.canada.ca/explore-programs/index.asp
https://www.canada.ca/en/immigration-refugees-citizenship/services/immigrate-canada.html