To answer your question, people call those who disagree with them liberals when they themselves are not liberals. It’s a shame that the entire country goes along with this controlling device called the two party system. But as things are, if you’re a person then you’re either a liberal or a conservative. A republican or a democrat. IMO, this is the dumbest thing in the world to go along with. It says “I will give up my individual thought process and let the label decide for me what I stand for”. Or, “I will allow myself to be labelled based on one opinion that I have”. As if it’s not possible to agree with someone only part of the time.
FYI, liberals call those who disagree with them “right wingers”. So it’s two sided. Sadly though, it is not any broader than that.