If I was talking to a black (African American or whatever PC term you want to use) and he said that he doesn't tan and I said, because you're black? Does that mean I'm implying he's a racist or am I just pointing out a characteristic about him that is true?
Calling you white doesn't mean she's calling you a racist. She's just describing your attribute. If your overly sensitive about something little as this, maybe social media isn't right for you.
It's probably just for show. They know these countries are irrelevant in visiting Thailand anyways and they just listed them to show that they are doing something to reduce the risk.