No one likes to be told that their work sucks. You put so much work into something only to be told that it needs a lot of work or isn't up to the standard it should be at. We all go through the stages. Let's look at some:
1. Shocked
Initially, we are shocked by the fact that someone would dare say our work needs more than what it already has. You begin to feel a sense of betrayal from this aftershock. "What did I do wrong?"
2. Betrayal
You feel betrayed. How dare they say my work needs some help? Who do they think they are? I put so much work into my essay or art project and for you to just come in and tell me its worthless. How dare you.
3. Grief
Maybe your work isn't that great. Even though Mom and Dad said they liked it doesn't mean you should continue to pursue it. Why don't you just give up already.
4. Self-Pity
You are worthless. Look at that piece of junk you made. You could have added more paint or glitter to it. Just because you were tired doesn't mean you should've stopped. You stupid, dumb person.
5. Doubt
Maybe you should change your major. You're obviously not cut-out to work and do the right amount of work.
6. Realization
Then, a beam of hope appears. Perhaps, your work isn't worthless. Maybe it's just their opinion. Just because one person doesn't like your work doesn't mean you suck.
All in all, take criticism with a grain of salt. It's only a person's opinion. It will all be okay.