Well as we said before, you have to see where he’s coming from. In his own way, Icepants IS trying to help, and the “advice” he gave is completely genuine given his own perspective about life. Is it helpful? Hardly. Articulate? Definitely not. But it is 100% honest in his eyes, and he’s the kind of person who believes harsh truth can prevent future heartbreaks… It would actually help a lot if he actually knew anything about what’s he’s talking about instead of assuming things and rushing to conclussions, but then again, some people are like that.Sans is not weak by any means, specially in the emotional area. He didn’t even consider Icepant’s claims of Toriel trying to use him as a possibility because he knows Toriel and knows she isn’t like that. However, there are things he still doesn’t know about himself, and that’s why the conversation had the unwanted effect of making him reflect in some things he had convinced himself to ignore. Icepants worked as a catalizer for what Sans is going through, but he is not the reason.