I wouldn't compare the cruelty done to animals on factory farms the same as the cruelty the jews experienced during the holocaust. I'm not "one of those". However, I am grossed out by discussions, pictures, and videos of harming or killing animals.

If I were a jew and Xaston posted pictures from the holocaust, or nazi symbols and Hail Hitler or whatever, people would be quick to say he was trolling. But if I didn't say anything here, no one would have considered his pictures posted as trolling. Simply put, it is acceptable for most people to troll vegetarians - to throw meat at them, to shove it in their face, to sneak it in the food you prepare for them, etc. and it really is not cool. It shows a genuine disrespect for a big part of their life.

Don't those two paragraphs disagree with each other?

No. You're missing the point. The point being you posted a picture of something you know I'd be disgusted and offended by (I could have provided a different example than jews and holocaust obviously). The point was NOT that animal's suffering is the same as jew's suffering in the holocaust.

But the degree to which it's a painful/sore/ethically wrong subject clearly has some impact on whether or not its acceptable as a "risque" joke or an over-the-line attempt at a joke.

The posting of a picture of dead animals in response to my story of how I became a vegetarian... you know, I am studying comedy, but something is missing there. A joke. Yeah, that's it. Apparently the joke was "this will disgust/offend him, haha".