In a nutshell, my sister is autistic. She is extremely intelligent (she attended an Ivy League school!) but struggles with social cues. This usually results in her dismissing me and being rude. My parents always tell me to get over it and that she can't help herself because she's autistic. But she doesn't let loose on others in the same way she does on me, so I don't think they get it. She just spits on it/me whenever something wonderful occurs to me, and she never, ever apologizes.