Ah yes, fall back on your only argument. It's like you never learned the old adage, if you have nothing better to say don't say anything at all. Some people, in your words, always complain about things or make up certain things in which they can then complain about. The question you forget to ask yourself is, "is my telling them off, saying that all they do is complain or say something in the form of me saying that all they do is complain, going to help at all with this person complaining?" And the funny thing is that even if you're brought valid points to their apparent complaints, you move the goal post. Change the subject, use a form of whataboutism. Misinterpret things in ways that benefits your argument and belittles theirs. Essentially, there is no getting through to you at a certain point when you come at people you apparently say always complain. You've already got it set in your mind. Game, set, match. No room for insight.