When someone says "who asked you?" to another person, it often conveys a dismissive or sarcastic tone. If you want to convey a similar sentiment without using those exact words, there are several synonyms you can use. For example, you could say, "Why do you feel the need to give your opinion?" or "I didn't ask for your input." Other phrases that have a similar meaning include "Mind your business," "Butting in, are we?" or "That's irrelevant to the conversation." The key is to find a phrase that conveys your displeasure without being too confrontational or rude.