I agree with @Swizzbeat, I've seen countless pictures, and even had the chance to fuck with bots who using some type of message response, for example using CleverBot. You can obviously tell it's a bot by the way they respond. I even saw on bot who said a random word every 20 minutes or so, and that was a horrid Idea, because every time I asked what the fuck, it never responded.
I feel you have more of a chance getting banned trying to talk back, than if you just ignored them, because honestly, it's not hard to outsmart a bot, and it could cause some issues down the road.