Is it a good or bad thing that she said this

My boyfriend has this girl that lives with him and his mom. I'm jealous because a year ago he was talking to another girl but said he thought she just wanted to be friends, and didn't know she was flirting with him. He says he doesn't understand when girls are flirting with him because he doesn't see why they would. His mom thinks it's just his autism. My boyfriend was playing Pokemon go and I saw her jumping all over him to see which one he caught. Finally I decided to nicely confront her and say I don't like her jumping all over him and she said "Honey, the only way I would be with am autistic is if they got a check, and he ain't got one". She was talking about disability check. While I'm happy she doesn't want him, I find what she said offensive. Idk how would you feel about that?

Edit: @Hazel she's his moms friends daughter who got kicked out.