A Brooklyn man claiming to be infected with the coronavirus coughed on FBI agents who were investigating him for hoarding medical supplies, the US Attorney’s Office said Monday.Baruch Feldheim, 43, is facing charges of assault and making false statements to the feds on Sunday outside his Borough Park home where he allegedly peddled and stored massive amounts of N95 respirator masks, federal officials said.Mask-wearing agents and other workers placed the eight pallets of medical supplies into a box truck.