You've labelled a sufferer of PTSD, depression and chronic anxiety as an arrogant misery guts, advised him to get a new therapist and effectively advised him to "lighten up".
When said member has requested the discussion ends as it's clearly distressing, you've continued. That's bullying.
But hey, you got some likes! So that's somehow valid evidence that you haven't been unkind, whereas someone actually calling you out on it doesn't count?