Well, if a sentence includes pig, It is generally rude in somewhere. – tugberk Jun 17 '11 at 14:06
I don't think you would say "The accepted way to eat crabs on Lake Pontchartrain is like a pig," even if it were true. So yes, I would have to say it is indeed rude. – Peter Shor Jun 17 '11 at 16:40
@FumbleFingers: I read an article which has a sentence like "people eat (something) like a pig", that's why I wondered and asked here, plus I didn't force you to answer this question. But honestly, I've never seen a pig and a pig eating, really sorry. – Gigili Jun 17 '11 at 18:40
I was thinking of "to eat like a pig" as to eat something in a greedy way or something, that can be polite. – Gigili Jun 17 '11 at 18:43
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@Gigli Don't mind him. I thought it was an interesting question (which is of course why I answered it). – Kit Z. Fox♦ Jun 17 '11 at 18:47
To me it sounds better (though no less rude) to say "people eat like pigs" rather than "like a pig" - since people is plural, it sounds more natural to pluralise pig too. – psmears Jun 17 '11 at 20:15