Cops busted a lone protester -- angry with subway ads equating enemies of Israel as "savages" -- as she spray-painted over one of the controversial signs today.
A Post camera crew captured the bizarre conflict between suspect Mona Eltahawy, 45, and a woman defending the ads.
"Mona, do you think you have the right to do this?" said Pamela Hall, holding a mounted camera as she tried to block the barrage of spray paint.