This is a form of the “Nothing to hide” fallacy.

https://en.m.wikipedia.org/wiki/Nothing_to_hide_argument

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I’m touched that you think mid-50s is young, but bi-directional blocking is, and should be, the universal norm. Social media blocks are inherently about preventing harassment. If they don’t go both ways then they aren’t blocking anything. Hiding/ignoring content and blocking a user are two completely different concepts.

What you’re describing is groups of people sharing opinions that can differ with one another in good faith discussion.

The problem is, this is what fashies consider an “echo chamber”. The definition itself is not applied in good faith by certain cohorts. For example, people having good-faith debates are “liberal” echo chambers, because not toeing the alt-right fascist line is never considered to be good faith.