One really nice thing about living in a big city is that what you've described isn't really on display or encountered while going about ones day. It's more of a abstract idea, something that you know persists around the country, and is tragic and disappointing for people who care about the country, yet isn't really felt personally.
There aren't loud red hatted people wearing their political costumes, there isn't Trump (or Biden) flags and signs littering poorly maintained yards. There's no risk that the rando on the barstool next to you will repeat the recent thing they heard Biden did from Fox/Newsmax/Twitter, you're not going to hear whatever wacky conspiracy theory is currently running through MAGA world. You don't run into people whose identity is consumed by Trump (or Biden).
Are there Republicans around? Of course, mostly the old kind that have money. Not the MAGA kind. Rather the kind that have the sense to keep any sort of Trump support private.
Echo chamber? Sure. Is it a shame? Sure. But it's far better than actually encountering MAGA/deplorables on a day to day basis.