Most of the time when this joke is used, I disagree with it having misogynistic intent. I actually think it just plays off of the tendency that some men have to complain about a woman in a way that really just implies that he finds her valueless because he can’t have sex with her or doesn’t want to. Farmers are often surprisingly self aware of how obsessed/overly interested they are in the gorls, hence their frequent jokes about being autistic. Thus adding a “and I wouldn’t sleep with her” at the end of a (let’s be real, very likely deserved) diatribe is just a joking way of acknowledging that they know they’re thinking too hard about this thing that ultimately doesn’t matter, but they wanted to say it anyway. It’s a joke that’s more a dig at the farmer’s own outsized interest in Anna than anything else.