Very interesting subject and I find myself in agreement with Bananiot and Miltiades.
1. What others do is no excuse, two wrongs don't make a right even in Cyprus.
2. It is wrong for the President to conduct official business as if it is his personal business.
3. I hate wearing ties and I detest people sweating under the "proper" but in reality improper clothes. I studied at the English School in Nicosia from 1954 to 1961 where wearing a tie was compulsory even in the summer. When I finished the school, my first reaction was relief that I would not have to wear a tie everyday.
I believe that during State visits, the diplomats on both sides agree on dresses too so that if one will appear just with a shirt, so does the other. Now it may be that the Chinese officials are also fond of "sweating" dresses, so it us not do injustice to "the president" on the conduct of dress. Perhaps he had no choice.
ismet
PS: Is your name "Bananiot" derived from "Banana idiot"? Sorry my friend, I could not help that one