Strawman fallacy this, oop that, you need to spend some time outside twitter threads. I'm not sure how you're misinterpreting what I'm saying so I'll say it in the most clear terms.
I have stated in multiple threads that interacting with children in a social manner is weird behavior. I am saying this as a 22 year old so maybe its just weirder to me because I may be older than you. For example, if I was in a game of Valorant and there was a 13 year old on my team and I decided to add them afterwards, that is plain weird. I am actively seeking that relationship out. It isn't weird because it's sexual, its weird because my maturity level is different and me interacting with that child would be exhausting/annoying so why would I do that? What level of friendship would we have?
You came back to me with an example of you interacting with someone you're close enough to call "little brother." Feeding him, carrying him. While I don't have siblings, I grew up with my cousins who are way younger than me. For example, they're all in middle school/high school. They're older than your friends brother but I have similar experiences. I take them to practices, am there when they need advice, I'll play Fifa with one of them if he wants to etc... These are my duties/roles as the "older brother" figure. I didn't ask for it, but it is my responsibility.
These are two different scenarios yet you're putting them together as if some stranger on the internet was the same as your cousin/brother. I'm just not sure what you're arguing here? Like what are you pressed about? That I don't hang out with underage children? If you want to have a good conversation, then go ahead. But if you're just going to act like you're getting impressions on a tweet, I'm done here.