They probably were somewhat ungrateful but I believe many people, maybe even most people in the Western world are ungrateful in some shape or form.
How many times as a kid did you complain about something only to have an adult say "Be glad you aren't a starving kid in Africa."
Often people want the best and most possible of anything that exists and are disappointed and bitter if they don't or can't get it.
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We're all going to die, all of us, what a circus; That alone should make us love each other but it doesn't. We are terrorized and flattened by trivialities, we are eaten up by nothing.-Charles Bukowski