It's not okay to be discouraging to your friends.
Jan has a high school friend named Wally who mentions that he wants to be an engineer one day.
Jan wants to respond about Wally being an engineer.
Jan tells Wally that he can be an engineer if he works hard and applies to the right school.
Jan tells Wally that being an engineer requires math, and he's not good at math.
Wally will become inspired and look up the path to being an engineer.
Wally will become discouraged and reconsider his dreams.