Question: Is there a fallacy for trivializing evidence?
Well, that's more of a cognitive bias than a fallacy, because they don't really argue from fallacious point of reasoning, but rather a stance of
'not knowing what they don't know'. (Dunning Kruger) I suppose it might be considered an Argumentum ad Ignorantium, but there's no valid argument here other than red/blue/blue red.
Even the claim, "Well we all see them red with our eyes, and there are certain chemicals inside tomatoes like lycopene and carotene that make them red" is an Appeal to Authority, but it can't really be considered evidence or logic without further citations, verification, or, at the very least, a strong analogy such as: Mammal blood is actually blue until oxygen is introduced whereupon it appears red.