I'm American and Hispanic and been to leipzig and the surrounding areas quite often since my best friend lives there. I've partied and bbq'd in the various Dorfs surrounding as well and have never remotely encountered such a thing.
I'm German and been to US many times. Some of my best friends lives there. I've partied and bbq'd in the various cities there and have never remotely encountered such thing like the one cited in the linked article. Do they exist? Definitely. What is your point?