There's plenty of left wing echo chambers, but they're leftist, not liberal. r/wayofthebern, for instance, or one of the various communist subreddits are good examples.
The difference here is that leftists extreme enough to fall into those echo chambers are far less common than conservatives. And, of course, they represent a very small subset of the left when compared to conservatives who accept misinformation.
No, he's right. It's not a matter of opinion, either, study after study shows that conservatives are far more accepting of misinformation and far more likely to spread it.
In my experience, they're also far less tolerant of dissenting views. I mean, they're the kings of culture war boycotts and cancel crusades, moral panics, and their latest thing is to call anyone who steps outside of their sexuality box a pedophile.
I seriously don't understand why I should care