nah, anything is more correct here. it’s like and/or vs neither/nor. “i do understand everything” is the grammatical opposite of “i don’t understand anything”. “i don’t understand everything” is a different sentence entirely. it would only imply that there are aspects of “everything” they don’t understand, rather than that there is nothing they understand.
maybe the bumper sticker misspelled “everything”
nah, anything is more correct here. it’s like and/or vs neither/nor. “i do understand everything” is the grammatical opposite of “i don’t understand anything”. “i don’t understand everything” is a different sentence entirely. it would only imply that there are aspects of “everything” they don’t understand, rather than that there is nothing they understand.
Then I guess Resol completely misunderstood it.