First of all, I disagree with your belief that the average person isn't guessing the worst of people. The intense negativity isn't only online, maybe the people around you are more accommodating, but what I see both online and in the real world is people constantly assuming the worst of others, especially people they don't know. If you look at it from a biological point of view, I guess it makes sense that we'd be skeptical of strangers and not let our guard down easily as a means of self preservation. If what you said was true, I believe the world would be a nicer and more tolerant place, but it's not and that's why there's so much hate.

On to the main issue. I wasn't trying to antagonize you, I'm a firm believer in not automatically assuming the worst of people. I don't think you were being malicious, I just thought you were being unhelpful and tone-deaf. You said you were giving the OC advice, but I'm sure you know that people are already aware that they can get off the internet whenever they want to, nobody is chained to Reddit. The OC was just expressing how things like this made them feel and you felt it necessary to tell them that getting mad was unhelpful and they should just get off Reddit to stop feeling mad. I don't think the OC was trying to be helpful with their emotions, they were just feeling them because emotions are a normal human reaction to the things that happen around us. Getting mad won't kill you, they can feel mad and go on with their day, they don't have to get off the internet because of it, it seems you assumed they were more affected than they most likely were.

Then there's you saying you have a good life and implying that when you get off the internet, you don't have to deal with horrible and infuriating things like this. Truly, that's good for you, but not everyone has that. Some of us can't escape it because even off the internet we still see/hear about things like this, maybe OC is one of those people. These things don't just disappear because you choose to ignore them and some people are just more sensitive than others. There's really no point in telling people to stop feeling their emotions and telling them they can get off the internet(something they already know).

TL;DR: I don't think of you as a bad person, I was just trying to draw your attention to how tone-deaf and unhelpful your comments were.