I told my parents that I ended up getting in trouble.
What trouble are we talking about?
I wore a short dress to a restaurant and got thrown out by management because they thought the hem wasn't long enough.
I'm sure you looked beautiful. They shouldn't tell you how you should and shouldn't dress as long as you were not indecently exposed.
I'm going to take this complaint straight to management.
If you think you were treated wrongfully than you have all the rights to make it right. Go through the proper channel and be respectful, and you will be heard the best.