Similar to those jumping on the internet bandwagon, trying to be cool in front of their bookface and forum"friends"., using a phrase not original to them, trying to pass it off as their own.
And wrong, I'm not offended on behalf of someone, just trying to inform others that they are offensive.
There was no humour to bypass, And you're back handed apology is as weak, but not as ugly as your original "joke". A "joke" where you and like minded idiots rely the need to slag off a nationality rather than actually use any actual wit.
But I'll leave you in your ignorance. To coin an apt Irish phrase "There's just no arguing with thick"