A character doesn't have to be hated by more than 50% of fans to be disproportionately hated. A character being disproportionately hated just means proportionately more people hate them than hate other characters with similar qualities/credentials.
There are a lot of elements that complicate this issue. For instance, what counts as fandom? If we're talking about the heavily female dominant fandom of fanfiction and tumblr and such, then I would say white, straight male characters often do get proportionally more hate than, say, WoCs (WSM characters also get more love, but those two things are not mutually exclusive). But OTOH, I suspect that in more male dominated fandom spaces, that is very much not the case.
Then there's also the issue of fandom popularity. Stories staring white, straight male leads are often the most popular; therefore they have a larger audience; therefore a smaller percentage of that audience still ends up equaling a bigger number of people who hate the white, straight, male lead. In such cases, the white, straight male lead isn't disproportionately hated, but for people who like him, it may feel that he is disproportionately hated, because compared to the non-white/straight/male characters they like, he gets way more hate.
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There are a lot of elements that complicate this issue. For instance, what counts as fandom? If we're talking about the heavily female dominant fandom of fanfiction and tumblr and such, then I would say white, straight male characters often do get proportionally more hate than, say, WoCs (WSM characters also get more love, but those two things are not mutually exclusive). But OTOH, I suspect that in more male dominated fandom spaces, that is very much not the case.
Then there's also the issue of fandom popularity. Stories staring white, straight male leads are often the most popular; therefore they have a larger audience; therefore a smaller percentage of that audience still ends up equaling a bigger number of people who hate the white, straight, male lead. In such cases, the white, straight male lead isn't disproportionately hated, but for people who like him, it may feel that he is disproportionately hated, because compared to the non-white/straight/male characters they like, he gets way more hate.