I am quite new to SO. That's why I wanted to ask if something was OK or general practice.
Today I answered a question. Someone else with a huge rep answered it too, but incorrectly. His answer got accepted, even though by that time the OP already figured out the problem themselves. Thus, the answer was known by the OP to be wrong. So, I commented on the wrong-answer-guy's answer, telling him his answer is wrong. Some time later, he changed his answer to the correct one.
Is this acceptable behavior?