They Were Too Polite
Politeness can come off as sarcastic if you’re not careful. That’s why you should make sure you get the tone right whenever saying “sir” and “ma’am.” If you’re not, then you might end up in the same trap of unemployment as the OP was several years ago.
Their boss kicked them off the team for seemingly being too polite, even though they were genuinely trying to behave at the workplace. The bosses could’ve told the OP to take it easy and not be so formal, but instead, they went straight to firing the poor guy. Lesson learned—never be polite.