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Its only rude if you just sat at the table, rake a huge pot then get up and leave.

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I don't think this is any different from the situation you had described previously.

At a friendly home game, the standard practice is to call a half hour. This gives the remainder of the players a chance to "win their money back" or at least have, what they feel, is a fair shot at doing so. Thus, no hard feelings when you leave with all their money. On the other hand, if you just get up and leave, people will feel resentful, especially if you have just collected a lot their money. Sometimes this is excused, or at least lessened, by having to take a lift home from a player that just went bust, catching a bus, or some other real-life-related time constraint.

It wouldn't be easy to argue why this is rude while you are at the table, as doing so would highlight the necessarily "gambling" attitude of home games in general. A good host will outline the house rules as new players join, but in the absence of such rules, there's really nothing that can be said.