Zac Efron angered many fans with a tweet on Monday, which happened to be Martin Luther King Day.<br />The Dirty Grandpa actor was slammed on Twitter after he wrote, "I'm grateful for a couple things today: Martin Luther King Jr & 10 million followers on IG," along with a raised fist emoji and pointing index emoji, both in black skin tone.<br />The following day, Efron, 28, deleted the post and issued an apology to his 21 million social media followers.<br />"I have nothing but the greatest admiration and respect for Dr. Martin Luther King Jr.<br />I realize that last night's post was completely insensitive and I apologize to anyone who I may have offended.<br />So sorry," he shared on Instagram.
