Some people do not understand the concept of distance.
Let me enlighten you.
In America and possibly Europe, it's considered friendly and okay to be open and comfortable with another person. In fact, sometimes it's rather good to be open and friendly with others, rather than being tense. It loosens and brightens up the atmosphere.
That's not the case in Asia, and by Asia, I only represent the Koreas and Japan since they are countries with customs I'm familiar with. I came across a gif of some European or American who was basically shoving a towel in Mao's face. I highly doubt she even met him in the past. Mao doesn't seem to mind, but making the closeness a one-way kind of feeling is considered pretty fucking rude.
Not to mention, Mao is my number 1 bias so people shouldn't be touching him in the first place. 8D Not even Mizuki.