How should I reply to someone else's fake smile?

First of all, pay attention to your manners, then you can reply to each other with expression packs, and finally express your opinions. When chatting, when someone gives a snickering expression, we can reply to each other with an expression pack. For example, we can reply with a smile, which means humor. I can finally reply to something that makes you so happy. When chatting with others, you must be polite, don't be too impatient, and you'd better learn to use emoticons reasonably, which can increase the interest of chatting.