"When someone says "LeBron who?" or "Michael who?" after a player makes a great play or has a standout game, it is usually meant as an exaggerated way of heaping praise on the player being discussed. The statement implies that the player performed so well that they momentarily overshadowed even legendary figures like LeBron James or Michael Jordan.
However, depending on the tone, context, and intent, it could also be interpreted as taking a light-hearted or playful jab at those legends, especially if the speaker is trying to emphasize how extraordinary the current performance is in comparison. It's not typically intended as outright disrespect but more as an over-the-top compliment."
No need to seek offense where none is intended or given in that situation