Woah, I had an experience like that when I was surfing through other social media platforms, but the tumblr page just hit me how nostalgic it looked and the fact that the conversation was going on also hit me hard at how sadly relatable it all is. Especially when you're trying to be genuine and help but there's only so much keys on a keyboard can do to convey your sincerity.
The way Keith would act, while I understand was coming from a place of hurt and drowned with negative thoughts, was incredibly insensitive and realistic. And the way MC would respond and apologize is them just trying to defuse the situation and lower Keith's hostility is so true. The general hypocrisy and asshole-like behavior of Keith once MC showed genuine concern over their well-being (and jesus, sharing pics of their self-harm) made me angry on behalf of MC even though I do understand where Keith is coming from, it makes no excuse either way.
I'm impressed how realistic everything is and how it's handled, I feel awful if you've gone through these experiences many times and felt fully responsible over the mental health of your friends, I do hope things are getting better and people have healed over them. Great job with this one, it felt really immersive!