Stands for
Racist,
Homophobic, "Transphobic, Misogynist, Anti-semitic,
Nazi Bigot" RHTMANB script is used by social justice warriors on the internet, used to make the other person aware that one is not being politically correct and/or has said something offensive, usually right-wing statements
Person
1: oh man, not the RHTMANB script!
Person 2: what did you even say to get that message?
Person
1: I dunno, I just posted a picture of me celebrating 4th of July, I
don't even know why this person bothered to go to my profile