.........Wat. Dean is VERY straight and Castiel is an amorphous asexual agender "beyond human comprehension" concept possessing a human body. Just because Jimmy the dude he's possessing is a dude doesn't make it a dude. That's been a thing the whole series with demons swapping from male/female bodies and seducing people in both. Cas doesn't have a gender, or sex, or preference. Did tumblr go THAT fucking crazy over gay sex in supernatural they turned an agender asexual philosophical embodiment of an idea into a romantic love symbol? Holy reaching, Batman. Literally

Also I got to like, two seasons before the end, I think