"He should be made to wear bangles, vermilion, bindi, and his face should be blackened" as he has "crossed borders of indecency," he told reporters after arriving here from New Delhi.
Prasad's sharp reactions came after Singh's comment on Gandhi, questioning whether Congress would have accepted her as a leader had she not been "white-skinned" generated a countrywide condemnation.
Claiming that Singh had indulged in "racist" and controversial remarks earlier too by asking "those who do not vote for Narendra Modi should go to Pakistan", the RJD Chief demanded strict action against him.
"There should be a stringent law to punish people like Singh. Such comments shouldn't be taken lightly. There is democracy in India and the people here become satisfied with apologies, but this is not enough," he added.
Taking potshots at BJP and RSS, he said they "harbour the mentality which is portrayed by people like Singh".