Apparently, Lemmy doesn’t believe the man who writes misogynistic lyrics can be sexist. It’s the same all over the internet. Quoting Reddit users:

a) Rammstein’s lyrics can be rather extreme, as they often include rape, incest, death, sex tourism, necrophilia, etc etc. But are they sexist? No I don’t think so.

b) A lot of their songs are out of someone’s perspective. Like Ausländer can be perceived as a sexist song written from a perspective a dude (Till lol) shagging his way around the world and seducing local populace with his foreign allure and hilariously low effort “knowledge of the local language”. […] On the other hand what the band actually intended to do is criticize colonialism.

One does not need to believe the sexual allegations to see that, still, something’s fishy, especially with the lead singer. The lyrics, the orgies, etc. For years, I have disliked songs and interviews because of this, but it all gets the “It’s satire” or “It’s symbolism” pass.