Wars have been fought over less.
The guy committed an "US crime" in Russia, where what he did was not illegal. He arrived on US soil, where he committed no crime.
He was still arrested and charged.
It's not like if the US laws didn't have any extraterritoriality.
This is a disingenuous argument. The US has never passed a law that is this easy to violate outside of its own borders, is this ripe for abuse, and carries such enormous penalties and burdens for essentially everyone in the world that wants to operate a website. In fact, no country has ever done this before.
GDPR is different, and not in a good way.
The US has clearly passed many laws that meet all those criteria but the last (and with much harsher, often criminal rather than merely financial, penalties), so unless you believe that operating a website is somehow a unique class of activity deserving special protection from extraterritorial application of laws, this is a pointless comparison.
And there's actually a number of US laws affecting website operators that arguably meet all three criteria, as other comments point out.
The US has a law requiring US citizens living and working outside of the US to file taxes in the US. Not doing that is a crime. You'll probably argue that this is different, since it concerns American citizens, but it isn't different, because it's a US law that is very easy to violate outside of its borders.