My remark was anecdotal from my experiences and nothing to do with what Ozil may or may not have said.
My wife is German. She has German expat friends, who also have German friends and family that make visits. Many of the people I've met through them have no use for Ozil, even when he was a shining light for die Mannschaft. From discussions with them, they have said many in Germany don't appreciate the Turks that have immigrated there. Not for racial reasons but because they feel many abuse the social services system in Germany.
As for it being racial, I think about 90% of Turkish people are considered Caucasian but that is probably being pedantic.