What are some topics or ideas that just can't be mentioned on Atrl because they guarantee huge drama?

Anything Beyoncé related. You could say that about several other popstars too, but I feel that Bey draws an insane amount of anger here

Literally everything.

all of the extreme topics

religion
race relations
abortion
guns
continents

Racism, Feminism, SJWS, Gaga (in your case in particular), Masc vs Fem gays, etc etc

Things involving race
Things involving R8
Things involving Iggy
Things involving Beyonce
Things involving the grammys (applies only to monsters and Kats)

Every underperformance by a pop girl, especially ARTPOP (see your post history) and your infamous pic. But it seems you're now more tame and less rabid (until Gaga flops again). Other than that, racism.

Rihanna & R8 related things.

Anything and everything involving a certain Stefani Germanotta.

.

It'd be easier if you ask what are some topics that DON'T actually guarantee drama.

If you say anything about God if gets closed immediately.

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Well, ATRL exaggerates everything. If your successful for a few years you're the "new queen of pop!!!!1" but once you have one flop, your career is over, you're a fad, retire. Everything is blown out of proportion

SJW

Shade, Dragging, Etc.