euphorian 寫: I would choose to point out his or her mistakes in private. Mainly, because this is a potentially delicate and sensitive situation.
Discussing on this forum is more beneficial for all of us, because this forum is a brainstorming platform for English learning.
In this public forum, it's not a good phenomenon to discuss English questions privately. Once we just discuss questions related to English, it has nothing to do with the so-called delicate or sensitive situations. Even the opposite oppinions are kind of critical, it's also good for our English learing.
If everyone gets used to discuss privately, it's not a good phenomenon for the forum as well.