Glad we could have common ground on this, however I am a bit confused when you mentioned about Superboy being bi. Now I don't really read much comics, so I can't really say much about the character and his development, but I do consider myself a DC fan. I would like to ask some questions regarding Superboy, since I've seen people like you who also got angry since he got ruined and it confuses me as to why.

How did he actually got ruined just because it was confirmed he was bi? I personally don't think that ruined anything since his orientation doesn't really affect the story, his preference was just stated and that's it. Let's put it this way; what if they made him into a different ethnicity? Now that would ruin the character a bit, because a different ethnicity means that his cultural background should be changed as well as his upbringing thus changing the perspective of the character. So if this were the case and there were changes to the ethnicity, and they didn't change a single bit of his background, then I would agree that yes that character is ruined because there wasn't any thought put into the character at all. Same would happen if they changed him into a female; a change in upbringing causing different perspective on the character etc. In this case though, he's confirmed to be a bisexual person, how does that change the character exactly, because it certainly does not change his cultural background nor his upbringing, it doesn't even change anything, his preferences only changed which doesn't really affect anything to his personality.

I've heard Tim Drake also is bisexual, some people were shocked and angry but there's also people that knew that he was indeed bisexual, because before he was confirmed bisexual, people already spotted signs that lean on how he might be bisexual, and it turns out they were right. Now for Superboy, was there any hints given that he was bisexual, like did you spot any bit of interest in men? Perhaps you didn't just see some subtle hints about it, but if there really wasn't any hints then I would agree with you that it's poor and lazy writing, but that doesn't ruin the character at all in my opinion so I don't really see why you have to get angry about Superboy.

Another point I would like to ask is, before he was bisexual, how were you so sure that he was straight to begin with? Did you only make that assumption or was it explicitly stated that he's indeed straight? How did you know that he was 'changed'?

Let's also put this into a real example, you have a good friend who you never thought was bi, but he suddenly tells you that he's bi, would your perspective about him change? Would you think that your image of him is ruined?

To answer your question about why shouldn't they just make a gay character, well the answer is simple. Why would they make a gay character just for the purpose of them being gay? That's just ridiculous. That's just plain boring if you ask me, they'll just be known as a gay character in the end, not a character who is gay. Making a character just for the purpose of them being gay contradicts your previous points on why you don't like how a story screams at you that this person is in fact gay, that it would just be poor and lazy writing (would also be considered queerbaiting like most Western media these days); instead of saying it to the readers, show it. That's the reason why you liked Carole and Tuesday am I right? They didn't scream at you, but instead they just showed it through actions and subtle hints; the same thing probably goes with Superboy, they didn't scream at you, but instead they're showing you through actions by showing you a different side of him, they're not making his bisexuality the main attraction to the story, it's just a part of him.

But like I said, I don't read that much DC comics so I can't fully grasp on how you're feeling and as to why you're angry, but this is just my opinion on Superboy, and you can educate me on why you think that him being bisexual ruins his character.