Lets see:

PLEBS ARE MORONS

I don't see Core devs suggesting this. I'm not a Core dev, I consider myself a pleb, so I disagree.

Core devs could spend more effort on getting their knowledge to the plebs, though.

YOUR NODE DOESN'T MATTER

Insofar as to what gets in the blockchain, your node doesn't matter. With this qualification it's true.

NO TX IS NON-STANDARD

Core rejects many TXs as non-standard, mainly for DoS protection, which is important for the robustness of the network. Not true.

FILTERS DON'T WORK

That's a fact. Filters cannot prevent unwanted TXs to get confirmed.

JPEGS AND ALTCOINS WELCOME

That's something others put in their mouth. I hear more of "We don't want monkeydick jpegs, but if we can't stop them at the consensus level, there is not much sensible to do."

RUN BITCOIN CORE

The only reasonable thing to do currently!