Does a Monk reduce both an arrows damage and poison when deflect missile?

@Mazoshi1987Hi Does a monk need to reduce both an arrows damage and poison when they use deflect missile? if it is lased with poison. RAW, yes. RAI, I'd cancel the poison damage and let monk catch it if the piercing damage is reduced to 0

— Mike Mearls (@mikemearls) March 23, 2016