Gender roles are socially constructed, but I do believe there's a biological basis for dysphoria. Physical dysphoria can't be cured only with social transition. Not only that, there's a biological basis for attraction as well. Yeah, I definitely hate people who hide behind a smoke screen of "trans people can do whatever they want, but I'm not dating them," (they'd probably be attracted to trans people if they knew anyone irl) but attraction isn't a choice.