It isn't the sentiment, but rather the omnipresence of the most extreme version of the sentiment, that makes it seem artificial. It's not as if states like Iowa voting for a conservative figure is a surprise. (They voted against FDR during WW2)
I've never heard a liberal American IRL express more than mild distaste for farmers and their subsidies. I've certainly not seen enough IRL vitrol for people to engage in page after page of Reddit / Herman Cain award style comments on news comment sections on Youtube.
I can imagine the farmer handout being seen as offensive when conservative activists opposed bailing out student loans, but other countries do very similar things (Canada certainly does). It's just not political to give money to farmers, even when they are millionaires. Additional consolidation of farms will just lead to more egg price hikes when bird flu spreads to mega flocks on mega farms.
The other reason this doesn't seem real is that normally you'd have an angle behind this other than "Ha, you guys are fucked". Instead it just seems to be comments geared at arousing maximum anger, which seems like something I would do if I wanted acceleration vs. change.
I've also seen similar comments before, like the "Ha ha you didn't vote for Kamala and Gaza is in flames because of you".
It might be people terminally online, but it strikes me as being inorganic, not real.