Pinkie doesn't realize it yet. Like you could blame her, she doesn't have much experience in the subject. Shes never exactly had... a crush before. So really, you can't blame her.
I don't care if you're black, white, bisexual, straight, gay, lesbian, short, tall, fat, skinny, rich, or poor. If you're nice to me, I'll be nice to you. Simple as that.