This boy did nothing to be labelled as a terrorist. He did not blow up a building. He did not kill anyone. All he did was to tear down an Israeli flag in a democratic country. If someone can burn the holy book of more than a billion people in the name of freedom of speech, why is it a problem to burn the flag of an apartheid state? How is that anti-Semitism?
Presumably this happened in the USA. There have been several incidents of people burning what they clamed were copies of the koran (did anyone check that they were real?) in European countries, but as far as I know no-one has tried to do it in the USA. Presumably US laws prevent them doing so, or they would have done so by now. This isn’t surprising. If you look at a map you will see that European countries and the USA are on different continent6s and have different legal systems. To cite what happens in one as an example to the other is absurd.
What the boy did may not be terrorism – though the question of motives may come in here – but whereas the koran-burners burned their own property and made sure that no-one else was at risk when they did so, the boy tore down and burned someone else’s property without permission or checking other peoples’ safety – theft and arson to begin with.
I agree that the threats made against him do not reflect well on the people making them, but the people who disapprove of koran-burning threaten the “offenders” with death and in some countries – Pakistan, for example – the mere accusation has inspired real lynchings rather than vague threats on the internet.