Professionalism is important. When you're a professional, people take you seriously and it's like… they appreciate you… a lot. Like, if you need surgery, and someone tells you: “Hey. I'm an unprofessional doctor. Would you like me to perform a surgery on you?” You'll go like: “What!? Unprofessional!?".
But if he says: “Hi. I'm a professional doctor - come on in, I'll perform a surgery on you”. You'll say: “Okay, thank you! I'm coming! I'm coming!"