OK, so let's take an extreme hypothetical. Let's say I'm a local hardware store. One store. I send out mailings on upcoming sales. I have Europeans in my database, because I'm in a university town and lots come here for a post-doc and then head home.
I email them and it triggers a GDPR complaint. Where do they sue me? In a European court? Can I just refuse to go? In an American court? Under what law?
If I don't have a European presence, how do they enforce this?