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It mainly stemmed because people didn't like how Americans were using it due to how they interact with the sport. Also, because lots of people view the term "soccer" as classist because it's origins are related to class and sport, so that, affects it. Besides that it probably didn't become a popular term so much in America due to American football existing- but moreso because it had already gained popularity in certain circles in the UK and those circles overlapped moreso with American footy fans then those who called it football or footy did.
People who participate in this are just showing their ignorance of how the same language can differ between countries. There's also often a little bit of anti-American sentiment since many people only point out how Americans do this while ignoring that Australia, Canada, Ireland, and South Africa also use the term soccer >

If you hate the debate so much, why are you creating one with this post? >

It's unpopular opinion, and he's giving his opinion on the debate? >

He said he didn't like a topic, or when people discuss that topic. Then he brings it up, creating a situation for people to do what he doesn't like. >

Or a situation to talk about how dumb it is >

just end it by agreeing it's football like a normal person