Forget all the stuff out there that says the GDPR protects EU citizens. This is a question of jurisdiction and enforcement. Say I run a blog under a business registered in the US funded by advertisers in the US. A EU citizen that comments on posts issues a GDPR request that I ignore. Their government fines me. I tell them to get bent, I am out of their jurisdiction. What can they do at that point?
Dudes handle is literally neanderthal. To my knowledge the last neanderthals died out a long time ago and there are no direct descendants but go a head and warn me for ‘vocally harassing’ someone.