Just today an omni sought out a veg video on one of the youtube channels I subscribe, and replied with something like; "I like bacon unfortunately this is the only way to get it" (in the video new born piglets were being slammed to the ground and tossed in a pile still alive) so I asked him if all the suffering he saw was worth a few minutes of flavor on his tongue.
He flipped out. I was called a racial slur, told to "suck it", called a "dumass" and my great, great, great grandfather (not sure which one?) was accused of enslaving this 19 year old boys great, great, great grandfather. Then he sent me a friend request, which was not accepted.
So, an omni's words can be much more hateful and ignorant.
I know before I was ready to change my life, I had a strong dislike for vegheads & PETA and I didn't even know why... Perhaps I had heard I better? Perhaps it was because I assumed they thought they were better than me, when in reality, I was the one who was afraid they were better than me because deep down I knew eating meat and turning a blind eye to the animals that had sacrificed their lives was wrong.
You can't make them feel it, you can't make them accept your decisions. You can only hold strong to your own morals, present facts and visuals and hope something will move them towards change.