" <-- Correct (informal) In informal conversations, you will hear the use of "was" more often. Both tenses are correct in different situations. I haven't watched Gilmore Girls, but characters in such TV shows tend to have informal conversations most of the time.
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pructusHow about changing it into "were", which seems to be being so much recommended by grammarians. My non-native sense tells me that in this case, it should be "was".was is fine. Your non-native intuition is working pretty well I'd say.