Lydia - I am sorry that has happened to you. Suing your old boss will take a long time and will probably get you nowhere. Take this as a lesson that there are cruel people in the world and you are better than they are. Get on with you life, hold your head proud and remember what a good person you are.
Sorry you had this experience. I would say I don't see a case here unless you are *actually learning disabled,* in which case you might have a claim for disability discrimination under the EEOC.
But Judy is right, there is probably little that can be done here. People that call me are always surprised to learn that bosses can yell at employees and call them (non-race, gender, national origin, etc) names at work without breaking the law. It's not nice, but it's not illegal.
Hopefully you can find a better job!
Clark County, Nevada practitioner.