From an interview she gave Net-a-Porter:
"Steer clear of the internet and you’ll live forever. We did an Unbreakable Kimmy Schmidt episode and the internet was in a whirlwind, calling it ‘racist’, but my new goal is not to explain jokes. I feel like we put so much effort into writing and crafting everything, they need to speak for themselves. There’s a real culture of demanding apologies, and I’m opting out of that."
I'll be charitable and assume she's referring to the Dong jokes on the show (which gets one Tina eye roll.gif from me) and not the whitewashed casting of Jacqueline Voorhees, a native character (which is too insidious a form of racism for me to deal with in gifs). And while Tina doesn't have to apologize, I hope she learned something and tries to do better...