I unfollowed the subreddit that I found the person (BPDMemes) because I realized some of the posts were triggering to me. A lot of the memes seem to romanticize BPD and the shitty behaviours it can cause. And the mods aren't very active so sometimes people post things that aren't really memes at all and are just upsetting. Just wanted to add some context before I explained the situation. 

I saw a user on that Reddit that just posted results of an online BPD test (on the meme subreddit, probably looking for sympathy). I personally believe you shouldn't self diagnose. So I clicked on the person's profile and boom, there's an image of serious self harm (I figured Reddit would give me the NSFW warning if there was anything bad!). Not only did this trigger me as someone who struggles on and off with self harm, but posting pictures of self harm seems very attention seeky and selfish. In middle school, I impulsively posted a picture of my self harm on my Facebook and left it up for ten minutes before taking it down. And it's one of those things I still feel like shit about to this day. 

So anyways, after becoming triggered I kind of flew into a rage (I've been suffering with extreme anxiety lately and it often makes me angry). I messaged the person saying they give people with BPD a bad name and that they need to go to therapy or try meds instead of posting triggering pictures online. I also called them an attention seeker and realizing I fucked up and didn't wanna cause further damage, I blocked them and unfollowed BPDMemes subreddit. 

I fucking feel awful about sending that message. I really don't think this incident will repeat itself, but I've been so unwell that I worry. I don't need my own mental health issues to cause other people issues. Especially strangers. Do you think it would be best if I took a break from anything related to mental health or BPD on subreddit? I don't really know how to right this and I definitely don't think this complete stranger who received an ass hole message would want an apology.

What should I do? Am I a horrible person?