He discusses the negative merits of swearing and cursing.
Then, he closes the sermon itself with a condemnation of gambling. The first, most obvious hypocrisy is that before telling this tale, the Pardoner insisted on stopping at an inn for food and beer.
And even if he is not a moral man, he can tell a good moral tale, which follows.
In Flanders, at the height of a black plague, three young men sit in an inn, eating and drinking far beyond their power and swearing oaths that are worthy of damnation.
Then he stands in the pulpit and preaches very rapidly about the sin of avarice so as to intimidate the members into donating money.
He repeats that his theme is always "Money is the root of all evil" because, with this text, he can denounce the very vice that he practices: greed.
Yet, I trowe he were a gelding or a mare, is hardly non-judgmental (97.693).
The Narrator also spends a bit of time describing the different relics and showing the truth of what each relic really is; however, there is a point in his negative description of both the physical and moral aspects of this character. The Knight is grand, the Wife is pretty, but the Pardoner is downright ugly.
Thus, the Host has rather offended the Pardoner, who calls a stop at an inn to think upon som honeste thing whil that I drinke (165.40).
This exchange is picked up once again after The Pardoner's Tale is done. He is the owner of a tavern, encouraging food and drink. He also swears quite readily, and from the General Prologue, we know the Host was the one to propose the storytelling game in the first place.