you either don’t get it or are uninformed or just plainly a plant
I'll translate for you.
you either don’t get it Translation: I cannot think my way out of a paperbag, so you must not understand the subject.
[you] are uninformed
Translation: I don't have any thoughtful responses based on fact, so you must be ignorant.
[you are] just plainly a plant
This is a tough one. Translation A: You cannot be human if you disagree with me therefore you are a plant (or possibly a mineral)
Translation B: You spend hours posting thoughtful conservative commentary that undermines and directly destroys liberalism. It makes so much sense, but doesn't satisfy my emotional needs to throw a tantrum and break things, so you must be a liberal mole sent to upset me.
How did I do?