I believe it can't, because the omission of was makes valued and stigmatized paralleled.

The thing they were good at at school wasn't valued, or was actually stigmatized.

  • If you wanted to remove one "was", you could say: The thing they were good at in school was actually stigmatized or not valued. – AIQ Oct 16 '19 at 21:26
  • If you remove was, the sentence will still be grammatical. So, it's fine to do so. However, doing so would alter the meaning of the sentence, because it would then be saying that the thing they were good at wasn't stigmatized. – Jason Bassford Supports Monica Oct 17 '19 at 2:52

No, "was" can't be omitted, for the reasons that you give.

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