I think you and Acty each live in your own filter bubbles, constructed mostly through subconscious intent. (Beware of believing your enemies are innately evil and intentionally causing themselves to be biased.) Everyone is subconsciously inclined to read authors they agree with; it's more pleasurable and less painful. In your filter bubble, you read thoughtful conservative thinkers, along with cherry-picked bits of poorly-reasoned liberal extremist thinking, that those conservatives tear apart. And the reverse is true for Acty.

I suspect the internet is increasing the ease of forming these sort of bubbles, which seems like a huge problem.

FWIW, I am disappointed to see political discussion drift from object-level political disagreements to person-level disagreements about who is more biased. I virtually never see a good outcome from such a discussion. I suppose it's an occupational hazard participating in discussions on a website about bias.