Why do people get mad when you say "the juice isn't worth the squeeze"?

Don't take this personal this isn't an attack on anyone. But why do people get mad when you say the juice isn't worth the squeeze. You're not saying they're worthless. You're simply saying thier bad points outweigh thier good points.

Why don't people take that as a positive that they can improve? Shouldn't everyone want to improve?

Why do people get mad when you say "the juice isn't worth the squeeze"?
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