Full definition of diplomacy as found in Merriam-Webster:
1: the art and practice of conducting negotiations between nations
2: skill in handling affairs without arousing hostility
3: the work of maintaining good relations between the governments of different countries
4: skill in dealing with others without causing bad feelings
On July 20th, 2015, the Cuban flag was raised for the first time in over half a century at what was once again be the site of the Embassy of the Republic of Cuba to the United States of America. On that same day normal diplomatic activities began across the Florida Straights at the reinstated Embassy of the United States of America to the Republic of Cuba.
No longer will there be interest sections. No longer will the Czech Republic or the Swiss need to bother with the issues of either nation across the Atlantic. With the re-opening of both these embassies; Cuban in DC and US in Havana, both countries began what is known as "a diplomatic relationship of one nation's government with another," key word here being "government." To put it bluntly: These shall be diplomatic representations to governments, something that takes place when one country's government recognizes the legitimacy of another country's government, again, key word: "government." When you are a serious diplomat you do not establish open parallel relationships with peoples or groups of peoples who are openly intent on undermining the legitimate government to which you have presented letters of credit! It's really as simple as that.
Diplomacy is not meant to create chaos or disrespect. Quite to the contrary, it was created, and has been practiced for centuries, in order build proverbial bridges, to prevent hostilities and bring about order in as peaceful a manner as possible. So please, more respect to both countries. And above all, more respect to the peoples of these two nations who have spent the better part of more than half a century struggling in a peaceful manner in order to reach this point in history.