Atlanta rapper Bobby Ray Simmons, better known as B.o.B., sparked controversy recently over his insistence that the world is flat, something he probably should have learned about in his youth, if not at school, then at least from watching cartoons.

But the rapper is likely to become subject to far harsher condemnation after releasing a new song, the aptly titled Flatline, that disses astrophysicist Neil DeGrasse Tyson, who naturally disagreed with B.o.B.’s assertion.

@bobatl Duude — to be clear: Being five centuries regressed in your reasoning doesn’t mean we all can’t still like your music

— Neil deGrasse Tyson (@neiltyson) January 25, 2016

In Flatline, B.o.B. raps, “Neil Tyson need to loosen up his vest / They’ll probably write that man one hell of a check,” referring to the conspiracy theories he’s been promoting as of late.

The song also suspiciously dwells into anti-Semitic territory: “Stalin was way worse than Hitler, that’s why the POTUS (President of the United States) gotta wear a Kipper,” he rhymes. What?????

He then digs into the rabbit’s hole even further. “They nervous, but before you try to curve it, do your research on David Irving.” Irving, a discredited British historian and Nazi sympathizer, was a notorious Holocaust denier.

According to Wikipedia, B.o.B. dropped out of high school in 9th grade. Listen to Flatline below: