There is no set of "normal" things that a large majority of people all share. You can do things you consider normal without being a defensive asshole about it when it negatively affects somebody else (and vice versa, but I'm responding to you, not the OP).
Replace normal with common, and my original comment stands. In many cultures people often casually say "how is it going?" when they don't mean it literally and they are just expecting a token "good, you?" in response. Some people might view it as unnecessary and insincere, but they don't generally go around lecturing others and telling them not to do it. When you're faced with a harmless cultural behaviour like this, the polite thing to do is just accept it and move on with your life.
Culture (and the norms that emanate from it) are a thing that exists. They may be localized to certain communities, but they’re not something you can deny the existence of.
