Well, I can always bring up the topic of Soapstone's view of romance and love. First of all, he has no idea what that is in the first place since the only person he had been talking to is himself. Secondly, when he does figure out the meaning of love, I'm pretty sure it would be a rare occasion if he even genuinely likes a person, tolerating their presence wherever the two may be at the moment. I don't know, maybe I'm being a little too harsh on him, but I know for a fact that if Soapstone doesn't yell at you or sigh in exasperation when you enter the same room as him while he is testing things, you can safely assume that you are on good terms with him.
Edit: Basically Soapstone liking someone is pretty gosh darn rare, but loving someone is out of the question for him. I don't think he would have a big enough heart to even support something like that.