I think that's misuse of the rectangle. If your rectangle can say things like that, you need to fix that (i.e. disable notifications or, better, get off of most social media or greatly tighten whom you interact with there).
I wouldn't say it's the platform's fault or consider it misuse of those experiencing that.
We should be using online spaces and platforms to engage with one another. We could use these to reach out to each other across the world for a variety of positive purposes. It's just unfortunate that most platforms are filled with hate and a lot of people out there would rather have negative experiences and some engagement, than no engagement at all.
Obviously that's not exactly healthy but that's how some people seem to be. I also question how healthy society would be if we all eventually ended up in the position of refusing online interaction for this reason.