To me, echo chambers and safe spaces are the same thing. It reminds me when students protest at campuses for "triggering material" to be removed because it has the ability to hurt others, but if you're just going to remove literally anything that remotely disturbs a person then it'll just impede their development and mould them into fragile and overly-anxious people. Most of these things are mild inconveniences at best, they over-react over tiny things because it's what they've been taught to do. The things that were once considered unsafe have expanded to the point where literally anything emotionally hurtful is now percieved as "unsafe". When it isn't really, it's healthy for there to be opposing opinions because it creates good discussion. I think it's easy to distinguish those that are trolls and those that want to make genuine inquiries.