A manure farm is exactly what the name implies, they produce and manage (farm) manure from livestock for agricultural use. It’s not a “weird jeer” it’s just an accurate description of the property where the rally was hosted.
Typically the primary product of the farm would be the livestock though, not the manure. I’ve never heard of someone using an entire farm just for collecting and processing manure.
“Typically” aka “I’ve never heard of this practice before so I’m going to talk directly out of my ass and insist this is not a thing.” Jfc, blocked.
“Typically” meaning “old mcdonald had a farm, and on that farm he had a cow, not a steaming pile of shit”
Typically does not mean "anything else never happens.
You strawmanned, and then won an imaginary argument with yourself. What a child.
The idea of claiming that even the majority of farms exist with their primary export being manure is so laughable that its unbelievable you even tried to push that argument.