An echo chamber for calling CA liberal? That's just well documented reality my guy.
You don't care about US politics, which means you probably don't know much about them. So it very much seems like you're speaking about something you don't care or know about. Then when I, a person who does very much care about US politics, chimes in with insight you call it an echo chamber.
Honestly, it seems like you want to just say whatever you like and then rant and dismiss anyone who knows the topic and pushes back. Ironically, that sounds exactly like how an echo chamber works lol.