Overreacting to Protest

The link is to the full article. But here is the nuts and bolts of the reality;

For that, Ms. Wang has been charged under a law that makes anyone who "intimidates, coerces, threatens, or harasses a foreign official or an official guest or obstructs a foreign official in the performance of his duties" face up to six months in jail. Such laws are necessary to protect visiting dignitaries from attacks -- and to ensure reciprocal protections for U.S. officials abroad.

WTF is that ???

So does that mean, that on U.S. soil the 1st amendment applies to people so long as they are addressing U.S. citizens? And if not you go to jail?
Or so long as our officials get the same benefit abroad? Yea, we (U.S. dignitaries) would hate to hear what a crap job our government was doing meddling in the politics of another country, especially by the citizens of that country.