Yeah, meat's gross. I could go on for days and cite all the bacteria, cancerous flesh and other disgusting contaminants in it. (Of course that's on top of the animal suffering and pollution it creates.)
But, I don't think that's convincing any omnivores to change their minds about meat. It doesn't hit home. I liken it to the police ads that are trying to reduce drunk driving. They usually claim if you drink and drive, you'll get caught. But we all know this isn't true. People drink and drive all the time, and the vast majority of them don't get caught. And if they do, it's one time out of hundreds or thousands of times driving after drinking.
The same goes for meat. Everyone has heard about salmonella in chicken, E. Coli in beef, and being sure to cook it hot enough, and not cross contaminating utensils, etc. I always knew that it had all this disgusting bacteria and cancerous flesh, but it never made me ill. I ate meat thousands of times and didn't have a problem. So, I concluded that regardless of the process by which meat was contaminated, it didn't matter to me. The argument doesn't stand to reason. If meat were so disease ridden, wouldn't I have been ill all the time?
My point? Pointing out how gross meat is isn't a good tactic, since it a) tastes "good" and b) doesn't make people ill, usually. In my short experience, I've found global warming and personal health to be more compelling reasons to switch.