Everywhere is an echo chamber for people. Lemmy is generally an echo chamber for very politically Left people, but there are people in the Fediverse that are on the opposite end of the political compass as well.
The internet is kinda like the American Justice System:
Anything you say can and will be used against you
Most of the time there is no real justice
Lots of people complain about it, but nobody has actually been able to fix it