I am sorry you've had that experience.
I've had some very negative experiences on different forums (not PC) over the years. It felt very upsetting at the time, especially the first time.
I've found it best to entirely disentangle myself from such sites, deleting my account if possible and just move on.
If the site is abusive, why keep checking it to even know someone there is checking your profile? You have made it clear in your posts you feel that site is "toxic" and "toxic" enough you wish to warn others; yet, you continue to check in there?
Self-care might entail just moving on, getting out of a known toxic zone once and for all.
Please take good care of you!

WC