It's not accurate to say that all narcissists always start a text with "Hey," as communication styles can vary among individuals. However, it is possible for some narcissists or certain personalities to use certain language patterns consistently.
Using "Hey" at the beginning of a text message or communication is quite common and is not inherently linked to narcissism. It is a casual and friendly way to initiate a conversation, and many people, not just narcissists, use it as a standard greeting in informal settings.
If you've noticed a narcissist using "Hey" frequently, it may be because they want to appear charming, approachable, or to create a sense of rapport with the recipient. Narcissists often seek attention and admiration from others, so using friendly language at the start of a text could be a tactic to draw people in and make them feel more receptive to the message that follows.
Remember that while communication patterns can provide insights into someone's personality, it's essential not to make sweeping generalizations about all individuals who use particular phrases or greetings. Narcissism is a complex personality trait and should be diagnosed by qualified mental health professionals.