Most of the interaction I have with either is showing them my tailights, but when I've actually talked to them, it's the honda owners who generally rice me out to death, and the mustang owners stand there and "no way" about the engine that just killed their V8..
The Honda guys can't get over my stock looking exhaust.
The Mustang guys can't get over 1/2 the displacement making more power.
On the whole though, there are cool people everywhere, and there are jerks everywhere, so I don't really hate any particular group.
(Unless you want to include the driving slow in the fast lane group that IJ noted. I really do hate those people. They should be taken to the road side and given 10 lashes, but it would cause a traffic jam for sure.) LOL