"Of course! You're not a bad person, anyway. Like James says, you just were taught a lot of bad things." Remus doesn't always have the patience needed to deal with Sirius' misconceptions, particularly where muggles are involved, but even when he's upset with the other boy, part of him knows it's not Sirius talking when he says those things-- not really. "And your parents were the ones to teach you! They're the bad ones."