What I'm saying is that I'm seeing much more Stucky all over the internet. SteveTony is not even close. And I can understand why, although personally I prefer Steve with Wanda. Nobody said that you or me need to change our feelings or opinion, but if you really want to understand other people, that was a pretty simple explanation.
And do you really need a further explanation? Do you really can't understand why the Russos call Stucky a "love story", but not, for example,
SteveSam who are also very close friends? Why people ship Stucky so much, but not, again, Stam? Do you need a description of all romantic tropes which occur in SteveBucky relationship? Such as Bucky being "damsel in distress" for Steve in all three films? I have found what screenwriters M&M have to say about it. Yes, it's about Steve and Bucky in comic-books, but it's totally applicable for the MCU too.
"Their bond has all the elements of a classic romance" - that's what I'm talking about. Again, it doesn't mean that their love is romantic in canon, but you can easily understand, why people ship them.
Personally, I've heard something about Destiel, but don't know about any brothers ship, because I don't watch Supernatural. Yes, there are many M/M ships, but I don't see them all over the internet. It's usually just tumbler.
And maybe some crazy Stucky shippers are angry, but I didn't see it.
Then again, there are always some crazy fans in EVERY fandom. Nobody forces you to ship Stucky. People just want to ship what they want without people like you constantly teaching them: "You can't ship them, they are not canon!" That's the point when both sides become mad at each other.
Media like Vanity Fair or Forbes aren't angry too. They are just frustrated that the film shoehorned such lackluster Staron thing down their throats for no homo purposes, when there was clearly no time for it. Sometimes it's better not to do certain thing at all, than do it so badly.
And what actually would be so different about Steve's character if he were bisexual? Nothing at all. Person is not defined by the sexuality, that's not who he is. But still in the movies the most prominent feature of gay characters is that they are gay. Our culture don't treat them like all the other "normal" people. MCU has already made much bigger deviations from comic-book canon. It's just that certain people are ready to accept all these deviations but don't want Steve to be bisexual, that's all.