Writing prompt: The big put-down

This is the fourth in a series of short writing prompts inspired by Stephen King's "On Writing":

p.44-50
In eighth grade, Stephen King created a self-produced book based on the B-grade horror film “The Pit and the Pendulum” and sold it to his schoolmates. At the end of the day, he was called into the principals office and reprimanded for writing “junk.” He admits to having felt ashamed for years afterward about what he wrote: horror and science fiction stories, complete with sex and gore. In his memoirs, he writes the following: “If you write. . .someone will try to make you feel lousy about it, that’s all.” Write about a time someone tried to make you feel lousy about writing, or something else you tried to do.