My mom always ends up getting mad and angry when I make a comment about something, but then she makes hateful comments about me. When I tell her she does the same thing to me she says " but I'm your mom". Does that make it OK?

Give me an example.

Personally I think I'd start keeping my comments to myself

She will drop something and I would say "good job" in a sarcastic voice and she would flip but if I dropped something she would yell " dumb don't break it your can't afford to buy a new one".

She will drop something and I would say "good job" in a sarcastic voice and she would flip but if I dropped something she would yell " dumb don't break it your can't afford to buy a new one".
Stop commenting, especially sarcastically.