Naw, you’d be fine. Many of us have friends and/or relatives in the US; those who don’t have the sense to realize that Joe and Jane Average American who visit Canada typically are not the enemy. They’re just people looking for a pleasant vacation, or a good business trip, or similar. If Canadians have a beef, it’s with the Administration that floated the idea of Canada becoming the 51st state.
That being said, though, I’d suggest removing any “Trump” bumper stickers from your car, refraining from talking American politics with Canadians even if asked (might be a good time to visit the restroom or step out for a smoke if the subject arises), and changing uncomfortable subjects to something most Canadians would rather talk about anyway: the hockey game that will likely be on the TV of every bar and restaurant. Even if you don’t know hockey, a “So, what are the XYZ’s [one of the teams playing on TV] chances this year?” will elicit a lot of discussion and immediate forgetfulness that you are American.