Lupin is the only one of the Marauders who notices Snape's talents in potions and Occlumency
Well, Remus is... not the worst.
As I said, I'm conflicted about him. Some people say he's a huge hypocrite with Severus, acting all polite and everything but that it's just an act, a way of saying 'I'm better than you, look at me being all cordial.'
Or maybe he's genuinely trying to be nice and get past their history. And it's not working because Severus is extremely spiteful.
And I mean... it's nice to praise his skills, but maybe apologizing and taking accountability would have been better? -_-