New York's bad manners are often condemned and often very deservedly. Even though the cause is carelessness rather than intentional indifference, the indifference is no less actual and the rudeness inexcusable.

“Condemned” means criticized or disapproved of, and “very deservedly” means that criticism is justified. So “often very deservedly condemned” is closest in meaning to “justifiably criticized.” The passage says the bad manners may come from carelessness, but that does not make them acceptable.

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