I'd rather be a dog and bay the moon,
Than such a Roman.

Cassius says:

Brutus, bait not me
I'll not endure it: you forget yourself,
To hedge me in; I am a soldier, I,
Older in practice, abler than yourself
To make conditions.

Brutus: Go to, you are not, Cassius.

Cassius: I am.

Brutus: I say you are not.

And so they get to it again until:

Cassius: Is it come to this?

Brutus: You say you are a better soldier:
Let it appear so; make your vaunting true,
And it shall please me well: for mine own part,
I shall be glad to learn of noble men.

Cassius: You wrong me every way; you wrong me, Brutus;
I said, an elder soldier, not a better.
Did I say better?