“Don't be so closed-minded!”
Your new boyfriend has a tattoo. Your father doesn't like your boyfriend because of it. When your father complains about his tattoo, you say this.
Don't be so closed-minded!
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Don't be so (adjective)
Use this when you don't like the way that someone is acting:
Don't be so lazy.
Don't be so shy.
(someone) is being closed-minded
A "closed-minded" person dislikes things that are new and different. Calling someone "closed-minded" sounds negative:
I can't stand closed-minded, intolerant people!
You can also say that a person is "being closed-minded" if they have an opinion that you think is old and incorrect:
Daddy, you're being closed-minded. Almost everyone these days lives with their boyfriend or girlfriend before getting married.