Encountered a possible victim of online extremist grooming

TW: gore, SA, ableism, grooming

I saw this troll on Tiktok victim blaming a child SA survivor, so I confronted him in DMs

Troll proceeded to spam offensive gifs (i.e. Junko Furuta) and said he took pleasure in ragebaiting ppl. Proceeded to say I was a SA victim like Junko and made fun of me. Also made ableist jokes (I have autism stated in my bio)

Ignored him, after a day he came back and shared a gif of a cat getting blended. Then shared a post of how autistic ppl likely suffered SA, and that it was my fault for allowing it to happen

On his stories, he said he was proud to be in "problematic communities" on Discord featuring necrophilia and gore

I tried reporting his messages but Tiktok did nothing (classic). Nothing to report for his posts as they weren't problematic, just pics. I blocked him after that

I've heard of online extremist groups targeting teens, but encountering one online was surreal. Guy reposted a few school related videos so I'm clocking he was in that age range

I was wondering if anyone has a similar experience?