Is it against the rules to reply to someone else's comment in a thread?

So, essentially, moderator Powerlock called me out for trolling just because I decided to jump into his conversation with another user. If this is actually against the rules, where exactly is that policy documented?
Isn't there a private messaging system specifically designed for private discussions? 🤷
Thanks

You’re actually kind of trolling right now, if you think about it. My post, which you’re responding to, was directed specifically at Kojiri; it was tailored to him and follows the long-standing tradition of back-and-forth debates we’ve had on this board for years. He knows exactly what I was asking. You don't, so if you want to be decent, stop inserting yourself into our dialogue like this. Just watch—if you're interested—and learn from it. That goes for you even more, considering you're still relatively new to this community. Look, just let us veterans have our discussion in peace; if you're curious about what we're talking about, follow along, and if you aren't, then don't—but please, don't feel this desperate need to butt in.

So, moderator Powerlock finally got back to me

There isn’t actually a written rule on this forum that covers this kind of behavior. But honestly, there’s no need to put those things in writing when, fortunately, most people seem to have picked up basic decency through their upbringing and education. That tiny minority who missed out on those life lessons stands out quite sharply from everyone else—making them easy to spot, and perhaps giving us a chance to teach them how to behave so they might eventually have a shot at becoming decent human beings. >

Basically, it’s not technically "banned," but you still get slapped with a warning for trolling, along with a lecture on your lack of manners and a glimmer of hope that if I stop replying to quoted text that isn't even mine, I might actually stand a chance at being a polite person.

Thanks for the masterclass in politeness regarding the Ukraine thread.

Look, there’s absolutely nothing wrong with jumping into a thread that was originally meant for someone else—I think we all love a good side conversation now and then—but honestly, it feels like you either completely missed the point of what they were saying, or you're intentionally twisting their words just to suit your own argument.