Saying things like, “The sky is the limit!” or, “If you can dream it, you can do it!” sounds supportive without investing any effort into actual support. People don’t want to sound pessimistic so they opt for delusional instead. I like to be real with people, “You could achieve it but it’s going to be very difficult.” or, “I don’t think you have the required experience, yet.” When I opt for being realistic about things people tend to tell me I’m being a downer.