Both are possible. The past perfect would make it clear that the lack of birthday greetings preceded his anger.
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sb70012But don't you think that "wished" is wrong because logically his anger must have come after the (not) wishing?Because we know that, it is not essential to use a past perfect form.
sb70012How do you interpret "wished" in #1 that it works for you?I probably would not even think about 'interpreting' it. If it were vita
sb700121. He was very angry because not one of his friends wished him a happy birthday.No.
sb70012Why can't "wished" work?