lackusation - When someone tries to tell you that you're the worst, like y

When someone tries to tell you that you're the worst, like you're the last pizza slice at a party.

My mom said I had lackusation. She said I was the worst at math, even though I got an A.

My teacher gave me lackusation. He said I didn’t try on the science project, even though I did.

My crush told me I had lackusation. He said I wasn’t cool enough to hang out with his friends.