This isn't true. People who not feel emotion are sociopaths. Unless you meant they feel emotion but in a different way. But even that isnt really true. If a person with aspergers genuinely thought you wanted to know something they would probably share it with you. Their emotion is either low vibe (content) or high vibe (very happy, very angry, very sad).
Many people with aspergers hate repeating themselves (if you aren't going to listen then why are you trying to talk to me?) They don't hold formalities and conversational courtesies the same way the average person does. They just say whats on their mind if they want to talk. And if you get two people with aspergers in a room together they can usually converse extremely efficiently in their own way. Half of it might even seem like another language to you.
They usually hate it when people lie and get stuck on it, but can grow out of it (the whole why are you talking to me thingy) and pay extreme attention to your facial features, body language and have decent to good pattern recognition. They aren't emotionally attached to little white lies and rather just throw the truth out. People with aspergers will share their emotion. Just usually not frivolously.
Flash a dude with aspergers and his eyes still go 0.0
Run over a cat and they still go
even if you cant pay enough attention to their facial features to see the difference.
Bully a weakling, manipulate them or let them see a grave injustice and you are likely to hear them yell louder than you've ever heard anyone yell in your life.