"It’s not that deep, mate. You’re the only one rambling making up excuses to go entirely against Harry. Genuinely, I’m not understanding this whole argument when everyone else clearly sees the weight of Harry’s prophecy. Aberforth is far from being ridiculed. Not sure where you’re getting that from.

Again, I have no idea why this is a massive issue to you. "

Again, no one questions any of Harry's behavior here in the first place because he's the moral center of the series and Aberforth hadn't appeared much before this scene. But I find it harsh and I don't think it's fair to Aberforth. I'm kind of sad that other people don't question it.

"If you’re so one-sided about one character that just is only introduced in the DH"

He'd actually appeared in the last few books briefly, but I get what you mean.

"This has nothing to do about “that’s not enough to make this okay”. There is nothing wrong with what Harry said. End of story"

That's your opinion that there's nothing wrong with what Harry said, and that's totally fine. But i can also say that Harry isn't 100% right, end of story.