Depends on which country is learning it. First, I believe the phrase "It's all Greek to me" could refer to Latin. As Latin is a dead language, obviously it is very difficult to understand.
Second, I would like to bet that at least 90% of the people who argue for the Pro side originate from Europe, and that Chinese is the "difficult language" because it's the most widely spoken in Asia.
European countries use a different phonetic system than Asian countries. Europe and the Americas have an alphabetical system, where there are a set number of characters that are arranged and pronounced into different words based on their ORDER. On the other hand Asian countries developed a more pictogram-based system, where there are certain symbols that stand for basic categories, like "wood", "action", etc, or basic sounds, which are matched up to create different characters. A single character can represent a word or part of a word. Keep in mind that this is the standard for ALL ASIAN LANGUAGES.
In short, Asian countries all have an easy time learning each others' languages, and the same for countries in Europe and the Americas. What's difficult is adjusting to a different system of writing and speaking altogether. And Chinese is the target because, at over 1.2 billion native speakers, it is the most widely encountered Asian language. If Japanese had the largest worldwide number of speakers among Asian languages, then Japanese would be under scrutiny instead.
In short, blame your head, not the material.
This is bullshit. There are almost 130 countries that have signed to the Paris agreement. It isn't a concrete set of rules; however, "not a rule" does not mean "without consequences". Following that logic is the same as saying that smoking is technically not illegal above a certain age, and therefore cannot hurt you. Not only will pulling out of the Paris agreement really hurt America's image as a whole, it will also hurt Trump's image. As we all know very well, that is among the last things he wants. And while it's true that he did start on The Wall as he promised, Trump isn't exactly known for finishing what he starts. Many of his businesses are either frauds or went bankrupt at some point, and he is in heavy debt. As all of these businesses started off as supported ideas, it's likely that this new idea will soon crash as well.