Kitchen visitor etiquette

While at a most excellent St. Patrick's day party, I noticed that the host was carving the corned beef without regard to the grain of the meat, resulting in a number of slices that were tough to chew on. I wanted to point it out, but refrained, feeling that it may be rude to lecture someone in their own kitchen. Come to think of it, what is appropriate behavior in such a circumstance?

I didn't think there was a tactful way of bringing up a carving lesson at the moment, and let it slide.