How did you take this as an attack? An echo chamber is the exaggerated idea of hearing only a single opinion, as curated to your own beliefs. It doesn’t matter what the belief is.
Obviously no one is 100% in an echo chamber, but it’s also obvious that everyone is guilty of confirmation bias; and tend to prefer seeing their own opinions online. I never said anything about my own feed or accused you of being in an echo chamber. I just explained what one was because you implied that it’s impossible to be in a liberal echo chamber