Most Americans DO use Celsius. They live in countries in South America, Central America an North of the United States of America. Canadia is another issue, Imperial gallons and Metric for the rest. We are consistent so you should vent your frustration on the Canadians.
There are additional issues that are difficult to overcome. Beer has containers using ounces for measurement. A Budweiser is in a 12 ounce can. I know that REAL Budweiser is in containers that are 1/3, 1/2, and 1 liter (litre) containers, but that is in the Czech Republic. I only drink Bud in Cz.
Captbob does bring up a serious issue. Language. We don't speak English, we speak American English. I admit we don't even do that right. There are no rules so we shrug our shoulders and call it freedom.
Hope you had a great Thanksgiving.
Welcome to the group.