If you don't have an organization in EU, they can't sue you in the U.S. because it's allowed here. It's like the U.S. trying to sue local Amsterdam pot shop because they sell drugs to U.S. residents.
The US doesn't sue foreign pot shops because the sale happens abroad and they have decided to not bother with that but they absolutely could enacted such a law if they wanted. Who is there to stop them? The US actually does apply some of its laws abroad. Here is an example that is similar to yours https://www.insightcrime.org/news/analysis/as-us-prosecutes-...
Again, the problem is only enforceability. If they can't get hold of any money, a verdict is useless.
Some day you’ll wake up, and notice all your corporate bank accounts are empty and frozen.