Here is my question: What makes you think Destiel is not canon?
I am not going to prove anything. I am just simply don’t understand that after watching Jensen’s perfect acting, and all those efforts they’ve put since season 6, fans still think Destiel is not canon?
Supernatural team is working so hard to make sure their relationship is accepted by fandom; Jensen is also doing his best to show Dean’s love and emotions about Castiel. It’s not a easy job for everyone because it’s never an easy thing for Dean Winchester to fall in love with someone, especially fall in love with a guy; but they are working on that right now.
So, please have more faith on them.
Dean does love Castiel. Very much. However, he needs time to make Castiel and everyone understand.