There's a McDonald's near my home that I can order from if I'm craving garbage food quickly and don't feel well enough to leave the house, but they only get my order correct about 20% of the time. Another 20% of the time they make the wrong thing (e.g. the wrong kind of breakfast sandwich), and the remaining 60% of the time they forget to put half the order in (e.g. we ordered three of the Minecraft happy meal cube things a while back, plus an extra chicken sandwich, and we only got two of the cubes and no sandwich, plus we were missing two of the drinks for the meals).
The tariff issue is another reason not to patronize them, but at the same time if everyone in Canada stopped eating at McDonald's then McDonald's corporation would take a hit and thousands of Canadians would be immediately unemployed and thousands of Canadian suppliers of ingredients (beef, eggs, chicken, vegetables, etc) would lose a ton of business, so while I'd rather order from A&W for dozens of reasons I'm not outright boycotting American chains the way I am with American products.