Not necessarily, or even not likely a hypocrite. If keeping the ritual cleanliness is important for the monk's job, that is, having a better contact with the divine for the benefit of those around him, this is just specialization. The monk likely also abstains from other things, like eating meat, or having sex, which is a part of the same self-sacrifice for the sake of his service.

It would be hypocrisy if the monk commanded others to fight instead of him, while also declaring that he finds violence morally debasing and thus unacceptable for himself. But I don't think that laypeople would respect such a figure.