The U.S. Ambassador to Turkey went blonde on Instagram Thursday after the mayor of Ankara ridiculed American spokeswoman Marie Harf as a “dumb blonde.”

Ambassador John Bass posted this photo to Instagram Thursday, apparently using Photoshop to color his dark hair blonde (it doesn’t appear to be hair dye, but it’s not immediately clear) along with the caption “we’re all blonde.”

It was an apparent retort to now-deleted tweets posted Wednesday by Ankara Mayor Melih Gokcek, who referred to Harf as a “blonde girl” as he called her out for previous criticism of Turkish police crackdowns on public protests in 2013. He said that criticism is now hypocritical in light of the American police response to the protests in Baltimore. Gokcek tweeted a picture of Harf’s face next to a headline that said, “Where are you, dumb blonde, who said Turkish police used disproportionate force?” and added a comment in English that said, “come on blonde, answer now.”

Harf declined to comment on the Twitter insults, telling reporters she wouldn’t “dignify them with a response.”

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Write to Charlotte Alter at charlotte.alter@time.com.