Yes, but the thing is that many people automatically assume all vegetarians wear leather shoes.
For instance, a girl insisted to a friend of mine that I am hypocrite because I "wear leather shoes and a leather hat." I don't know where in the world the hat thing came from, seeing as I never wore hats to school, but instead of asking me she just made an assumption.
Also, I was discussing vegetarianism with a teacher in class once, and a guy leaned over and whispered to the other, "She's wearing leather." I made it clear that I had heard them and informed them that my shoes were plastic.
So, yes, someone who is veg for ethical reasons and continues to buy real leather is being hypocritical, but many people aren't intelligent enough to ask a person if their shoes are leather and just immedietly assume "you hypocrite".
Seeing that this ad was about as mainstream America as you can get, I saw it as a general stab at all vegetarians using a common insult and stereotype. Sort of like, "Oh, I bet you sneak meat when no one's looking!"
slops, gloops, and gruels.