to step on someone's toe

[Attila]

Hi All,

Someone wrote me that he's very sorry to send me such a snorty mail last time.

How to tell him that it's OK, I've already forgotten about it.

It isn't a problem, one can't hurt me so easy.
It isn't a problem, it isn't so easy to step on my toe.
It isn't a problem, it isn't so easy to insult me.

[Yankee]

Hi Attila

I like your 'toe' idea, but the idiom is plural:
It's not so easy to step on my toes.

How about this one:
No problem. I've got thick skin.

Amy