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The controversy of their comments rely in the fact that members were actually making too much fun of the situation by saying that they could only help with 6 dollars and they were being disrespectful and rude about the situation pretending they didn't know anything. These comments made Thailand people upset and offended.
And also it started an outrage over 2PM members who expressed their feelings on the situation. As some of you may know, Thailand is like a second home for 2PM members since Nichkhun is originally from Thailand. He expressed on his Twitter account, "As a Thai person I feel offended by those who speak about the Thailand floods without thinking. Also instead of coming to Thailand and acting mindlessly, please respect the country’s manners, and only act in a proper way."