The whole thing reflects badly on them both - which just illustrates what grubs they both are.
Trecherous Mal the multimillionaire tight ass who wanted a gossip with an equivalent political loser and ex union hack Bill who was happy to slag off his host as his way of saying thanks for dinner. Just to show though that Bill can’t taste the difference between a cheap drop and some decent plonk if he had to wait until the taxi on the way home to google the price.