As I said, I’m sure there are people who didn’t like Hannah’s character from the start (not everyone is going to like every character) but I didn’t see any hatred posts until the season 10 preview was released. It’s fine to not enjoy a character but the fact of the matter is most people kept quiet about that opinion until a romance dynamic was added to her, as if making her a romantic interest gave them permission to publicly hate her. People posting “Kill Hannah!” in response to the season 10 preview (which I saw many times) is not the same as you saying why you personally disliked the character. There is vitriol and violence behind someone saying “Kill Hannah!” and that’s something I’ve seen aimed at many female characters. When Carver did a pre-season 10 interview and said demon!Dean would have a fling with a waitress I saw posts calling for her death. We didn’t even know Ann Marie’s name yet and there were popular posts going around that said “By fling they better mean Dean flings her out a window.” Fans celebrated the idea of her dying when all they knew about her was that she’d be having sex with Dean. Season 10 also introduced Cole, a male character that much of the fandom dislikes. When fans talk about why they dislike Cole they always detail their reasons for disliking him, much like you detailed your dislike of Hannah, they don’t simply add “Kill Cole!” to every gifset involving him. For male characters, fans always give a reason for disliking them and they rarely call for their deaths, most of what I see says “They need to drop that character” or “I hope he gets written off soon.” When a female character is hated I see a lot of posts calling for their death and I very rarely see people give a reason for disliking her.
Brother and sister is how community members referred to each other in biblical times, in fact this tradition didn’t die out until a couple centuries ago. In the Bible, there are numerous passages that refer to “my brother” when a person is not talking about a genetic brother but a member of their community. Watch a historically accurate movie about the pilgrims and they’ll be referring to each other as brother and sister too. Many religious communities still refer to each other as brother and sister. This is why the angels do it. Supernatural established in season 5 that angels do not consider all other angels as siblings
Dean: You mean to tell me you’ve never been up there doing a little cloud-seeding?
Castiel: I’ve never had occasion, okay?
-Free to Be You and Me 5.03
When Dean asked if Cas had ever had sex with anyone in heaven he didn’t say that angels don’t have sex, or “gross, we’e related,” he simply said he personally had never done it. If angel on angel action was considered incest Cas certainly would have said so at the time, the Winchesters always point it out when Wincest is brought up in canon. Michael talked about raising Lucifer and the archangels seemed to consider each other siblings, it’s possible that most angels view their garrison the same way, but there are a lot of garrisons which means a lot of angels that they don’t view as siblings. Angels can be sexual, Balthazar certainly was, but there is a rule against angels having sex with humans. This means that sexual angels who follow the rules have sex with other angels. I was very surprised that the fandom used an incest argument against the Cas/Hannah story-line when angel on angel sex was talked about so early in the angelic story-line. It’s been long established that the angels are a community, and like in biblical times their community is their family, but they are not genetic siblings and can inter-mingle.
I agree that if Charlie were straight there would probably be more resistance toward her, even if she were only portrayed as a platonic friend. I think a clear indicator that fans view Charlie differently than heterosexual female characters is that I’ve seen many fans claim Charlie is the only female character to never have a romantic story-line. She had a romantic interest in her second episode, LARP and the Real Girl 8.11, then spent much of Slumber Party 8.11 flirting with Dorothy and ran away with her. So why do so many fans claim she’s the only female to never have a romantic story-line? Is it just because she’s never been romantically linked to a male character?