I'm not supportive of my girlfriend.
Is there a good reason you aren't supportive of her?
No, I think she's dumb.
You should be supportive of your partner. Thinking that your partner is dumb is not good or healthy for either of you and ending the relationship is my advice.
It's okay, she's not the sharpest tool in the shed. She's dumb and ugly with it.
You shouldn't be so mean to your girlfriend. You ought to just support her in any way you can.