Zac Efron's not the most popular celebrity on Twitter right now, and it's all because of a tweet he posted for Martin Luther King Day on Jan. 18.

Alongside a picture of himself in a pair of aviators, the 28-year-old wrote, "I'm grateful for a couple things today: Martin Luther King Jr & 10 million followers on IG."

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Fans were not enthused that the Neighbors star lumped his social media achievement in with the civil rights leader's accomplishments in the now deleted post.

Do you think Zac's post is inappropriate?