I don't like the present that my mom gave me and I'm going to tell her.
Can you tell me what she got you?
A point-and-shoot camera. I am going to tell her I'm not interested in it, just like I'm not interested in photography.
You should be thankful for the thought and keep that to yourself, as you might hurt your mom's feelings. Maybe ask for the receipt and tell her it doesn't work and exchange it for something else?
I don't need a fucking lecture about how I should be grateful.
Being gracious is something we should all strive for and even if you don't like the camera you should be thankful your mom thought about you and got you a gift. There are ways to exchange the gift that can be done in a way that doesn't hurt your mom.