The footnote is basically saying "I can tell when it's the case or not", which is in fact exactly my problem. That is not the answer that I'm expecting from someone who has self-reflection.

For example: "understand my argument" is assuming that the argument is obviously correct. When someone presents to you an incorrect argument, 1) this person thinks the argument is correct (otherwise they will not present that argument), 2) you will not answer by saying "I've understood", you will argue. From their point of view, you are the one failing to understand. Now the question is: how many time this person was you? How many time you presented a bad argument and then blamed the interlocutor for "not understanding" when they don't accept a faulty argument?

Same with "circular reasoning or rhetorical trick": when I disagree, it is always very easy to convince myself that there is a problem in the interlocutor logic. Especially if I failed to understand or misunderstood the argument. I would even say that for all discussions that are not trivial, there are always elements that can be seen as circular or rhetorical trick.