I find it interesting how the cast is treating Rem for what she did to Subaru, but what about about Otto and Garfiel? How are they being treated by the cast for what they did?
Otto is the one person in the Emilia Camp who legitimately gets a pass, because everyone ultimately agrees — with the combined factors of Subaru openly declaring that the White Whale chasing them both down was definitely after him, specifically, of them being aware that Otto was getting driven insane due to being exposed to the literal voice of the White Whale due to his Divine Protection, and of them realizing that Otto almost certainly sent Frufoo back to go and help Subaru once he came to his senses — that Otto literally did, at worst, what any reasonable person would do in that situation. (And honestly, he probably did a whole lot better than that…) Wilhelm has some very messy feelings about this still, due to Otto’s actions immediately preceding him having to watch Subaru crawl away crying for help from the scourge of the past 14 years of his life (aka. the single most traumatizing thing that this man, specifically, could have been forced to witness), but even he is largely aware that he’s not being fair. —Otto himself probably isn’t anywhere near this forgiving, noteworthy.
Garfiel is a lot more uncomfortable, but he has one advantage that Rem does not: he remembers being an actively antagonistic force in Subaru’s life. And everyone else remembers this, too. This might seem like it should make it worse for him, but it actually means that everyone has largely brought up and settled these underlying issues properly already, and so rehashing them is — uncomfortable, but not nearly as nasty a surprise as watching Rem actively torture Subaru onscreen for several hours. But of course, it differs from person to person. Some members of the audience brush it off as a settled matter, others are a little less forgiving, still others are resolute in their opinion that this is One More Person who can never be allowed near Subaru again, and that’s kinda just how it goes.
(It is also important to note that the quality of their relationships with Subaru AFTER their respective incidents are very influential here. Garfiel and Otto both became honest and genuine friends looking out for Subaru’s well-being in honest and genuine ways. Rem, meanwhile, pulled shit like repeatedly sneaking into his room to watch him sleep, enabling almost every one of his bad behaviors, and monologuing about how she wanted to take his gibbering, shock-stricken form and kidnap him far away from everyone else so that she could have him all to herself forever. This is a very important factor in how these characters are received.)