Don't tell them they aren't trying hard enough. Don't tell them the things they like are stupid/Childish/a phase. Don't assume anything about them. -Jinx <-- Next time my mom assumes something I am showing this to her.
In Kathrine Switzer was the first woman to run the Boston marathon. After realizing that a woman was running, race organizer Jock Semple went after Switzer shouting, “Get the hell out of my race and give me those numbers.