No derogatory intentions whatsoever.
My friend is from Cleveland. Huge Polish community. He brags about being a 'certain ethnic' person. (The Spell checker changed the spelling).
If it's Polish, he is proud of it including this term. I speak as a Polish person, myself.
I'll clean up the other post in the way that the TV station in Cleveland did years ago. They use the term 'certain ethnic', instead. See "Big Chuck and Hoolihan".
My apologies to anyone who may have taken offense.