Of course both can be used. "Very" rude is just a statement that can stand for itself ("it was very rude, but whatever"). "Too" rude relates to another action, such as "too rude to be forgiven".
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Of course both can be used. "Very" rude is just a statement that can stand for itself ("it was very rude, but whatever"). "Too" rude relates to another action, such as "too rude to be forgiven".