The U.S. ambassador to Turkey is fighting back with humor after Ankara's mayor called a U.S. state department spokeswoman a "stupid blonde."

John Bass posted a picture on his Instagram account with his normally dark hair digitally altered to a reddish blond. The caption said: "American Diplomats: We Are All Blonde."

Ankara Mayor Melih Gokcek had taken to social media to go after State Department spokeswoman Marie Harf for criticizing Turkish police tactics during demonstrations.

Earlier this week, Gokcek posted a tweet with an image of police in Baltimore forcibly subduing someone during the recent unrest with a caption that said: "Where are you stupid blonde, who accused Turkish police of using disproportionate force?"

The Tweet included a picture of Harf and said: "Come on blonde, answer now."