I think we should ignore her—but not ignore the people calling for her death.  The way I see it (disclaimer:  I know only what I have gleaned from this thread), she likely did what she did to protest exactly the sort of ultranationalist flag-fetishizing that produces the extreme reactions that she got.  Ideally, everyone would simply turn away in disgust and nothing more.  People like your grandfather are unfortunate collateral damage; her true target was the people that have now threatened her life. 

I hope she's not going to whine about getting the reaction she was aiming for.  (Denunciation=/=whining)

Yeah, but exercising your freedom of speech cannot be an abuse of laws that protect, because, it is a fundamental right. Diplomatic immunity is a privilege which is why some people can abuse it. You can't abuse your freedom of speech. It's a freedom and you can exercise it however you see fit so long as you aren't physically harming someone.

Apple to oranges.

But there's also laws against. Double edged sword.

Every time you say there is a law against it, I'm going to quote you telling it was overruled by the Supreme Court just a few months later until you stop.

And it was overruled by the Supreme Court  What part of that is lost upon you? 

https://supreme.justia.com/cases/federal/us/491/397/

https://supreme.justia.com/cases/federal/us/496/310/

That's like saying slavery is still legal simply because it was once.  If you don't know how the law works, the Supreme Court works, the Consitution works, just say so.

Otherwise, you should stop.  The burning of your own American flag is not against the law in the US or any federal, state or local jurisdiction.  There have been nearly 50 proposed consitutional amendments since the 1990 decision but none have passed.  If there was already a law against, why would there need to be new proposed laws against?  The reason is because there is no law.  The one that did pass Congress in 1989 was overruled and hence no longer law.

But go ahead. Keep ignoring it.

Irrelevant.  It was ruled by the Supreme Court as unconstitutional.  It would require an amendment to the Consitution to make it illegal again.  When was the last time an amendment was proposed and passed by the same Congress?  1971.  Almost 50 years ago.

Do you not understand what it means when the Supreme Courts overrrules a law and deems it unconsitutional?