Recommendations for a context aware text classifier

I've got a bot running/in development to detect and flag toxic content on Lemmy but I'd like to improve on it as I'm getting quite a few false positives. I think that part of the reason is that what constitutes toxic content often depends on the parent comment or post.

During a recent postgrad assignment I was taught (and saw for myself) that a bag of words model usually outperforms LSTM or transformer models for toxic text classification, so I've run with that, but I'm wondering if it was the right choice.

Does anyone have any ideas on what kind of model would be most suitable to include a parent as context, but to not explicitly consider whether the parent is toxic? I'm guessing some sort of transformer model, but I'm not quite sure how it might look/work.