Indeed, depending on how it's used, "mkay" can occasionally come out as impolite or mocking. In a serious conversation, it could come out as dismissive or indifferent if someone simply responds with "mkay." However, it's usually innocuous and humorous when use with friends or in a casual conversation. Context, tone, and relationship are important. To soften the message and prevent misunderstandings, add more words or emoticons. Know more about mkay meaning