One time and I only reflected Katou's post, it was a rude, aggressive post, so my reflection was precisely that as well. (The first post you linked was just me and AHH joking around, he's a friend of mine.)
Since you apparently still care about it, I'll let you know the conclusion to it. Katou sent me a private message and apologized. I said all is well in response and that's the end of the story, been friendly to each other before and after and already joked about it (but that could have been interpreted as hostile sarcasm by an outsider, just like you misunderstood that exchange between me and AHH. Sarcasm in itself is totally fine, it's a form of humour, but it depends on how and who you use it with).
You probably didn't read my other post, as I had already replied and explained it to you back then in the thread shortly after. Basically, I explained that I never thought that he was actually trying to insult me, I was quite sure that he was trying to make a joke but failed at it and I also explained why I decided to directly reflect the aggressiveness. Quoted from my old post: "Could have written it more nicely, I agree, but I also felt if he gets burned a little in response to his negative behaviour, he might learn from it better."
Hopefully this helps you and you can get it out of your mind now. It's been almost 3 weeks since, I'm surprised it has still been on anyones mind at all, let alone that it still bothered someone.
Achro, if you ever see me use sarcasm (or banter) with anyone on FG, it's probably because I know them well enough to make jokes and have confidence it won't offend them, I wouldn't use sarcasm with people that wouldn't understand it.
Cares about people behaving well and has a troubled mind because of it.