actually mean..?

[ahmin92]

I had a conversation with my brother last night. sort of like this....
him: He is slow, just stop pushing him. He can't jog.
me: haha! you are mean!
him: I'm trying to motivate him actually.
me: Nice saying to cover up what you're actually mean.

I felt that my sentence was incorrect that's why I came here and asked. the last sentence. Is it correct??

[billmcd]

I had a conversation with my brother last night. sort of like this....
him: He is slow, just stop pushing him. He can't jog.
me: haha! you are mean!
him: I'm trying to motivate him actually.
me: Nice saying (word or term) to cover up what you'reyou actually mean.

I felt that my sentence was incorrect that's why I came here and asked. the last sentence. Is it correct??

b.