So “what I posted about you lot” is sensible English.
And
“You lot know less about politics” is proper.
I can’t fix the first one because it is complete babble, but I can fix the second one.
“You lot know less about politics”. Should be:
You know a lot less about politics.
If it is really true that you can read what you wrote, and then see nothing wrong with it; then that tells me more than I need to know.
What I wrote is correct; what you tried to "fix", is ludicrous and changes the meaning.