I don't think it's cognitive dissonance if you recognize the issue. Also, you can both enjoy a good burger and be disgusted at the idea of killing a cow yourself. As you said, it's simply an hypocrisy (of which I am guilty too). From Wikipedia [1], (emphasis mine):
> In the field of psychology, cognitive dissonance is described as a mental phenomenon in which people unknowingly hold fundamentally conflicting cognitions.