OP here. Headphones, that's a great idea! I had some too, never thought of it. Probably my best option.
Yes, the people discussing were from farm/country backgrounds, and one was a woman. Heck, I'm from the same background and it's not so much that I'm squeamish, but it just upsets me to hear those attitudes and not be able to tear a strip off the person for treating animals like that (career limiting move) or give unwanted advice.
I may mention something if it happens again as well, the conference call idea and the other ideas are great too. Thanks so much!