You damaged your real world reputation trying to defend a psudoanonymous identity online.
If it isn't true, stop feeding the trolls.
I get that being harassed online and accused of the most heinous things is difficult. But you can't escalate your way out of it like that.

It's not like you hide behind this grinder persona to say hateful shit or harass people or anything else like that so as long as his accusations aren't true you shouldn't be too worried about your identity being exposed.