have the nerve to say something like that
君はよくもそんな口がきけるもんだ。
How dare you say such a thing.
よく、そんな口がきけるな！
How dare you talk like that!
よくもまあ私にそんな口がきけるね。
How dare you talk to me like that.
君はよくも私にそんな口がきけるな。