Flattered

I haven't ever heard such a response. I wouldn't be sure how to understand it fully. It doesn't sound right.

I would probably conclude that the response was an attempt be self-effacing by saying that the compliment was not fully deserved and was tantamount to flattery.

I've never heard it either, but my first take was that it was a play on that "Got milk?" advertising campaign. In that case, the response would be "Got milk!" So perhaps the "Got flattered!" was a response to just getting a compliment. However, I suspect that would be more an American usage. Don't know if that milk ad runs anywhere else. My two cents anyway.

I have never heard it. The one I often hear is 'I am flattered.'

So, that's 'I'm flattered'. No negative connotations?