Things about Supernatural that you need to learn to accept and tolerate (even if you don’t like it) if you ever want to be part of the fandom:
Wincest exists. It is not going away. And the fact that Sam and Dean are brothers is an argument that you cannot use against it because no one actually cares.
Destiel exists. It is not going away. And the fact that Sam will always come before everyone else in Dean’s life is an argument you cannot use, because even Cas knows that and he still sticks around.
Shipping of every sort exists. It is not going away. Because everything in this show is shippable.
Crazy fans exist among ALL ships. Do not argue with them; it’s pointless.
Jared, Jensen, and Misha are married. Their wives and children are not covers for their secret gay relationships.
Dean may not be 100% straight. It is completely possible that his sexuality is fluid and not easily labeled, and that he might be attracted to men. But it is also completely possible that he isn’t. Either way is probable and realistic.
Sam is not a saint.
Dean is not a saint.
Castiel is not a saint.
In fact, no one on this show is a saint. They all fuck up.
People do not view things in the same way that you do, and neither you or anyone else has the right to tell someone else that they are watching the show wrong or that they are not allowed to feel a certain way about the show just because you don’t feel the same.