I guess that I had better not mention the laws of Kashrus or keeping Shabbos; because if I do, then I’m denigrating every Jew who doesn’t keep them, right?
Dealing with the issue of what Halacha allows and doesn’t allow has nothing to do with judging specific people or their character, whether they’re nice or not nice.
If a woman unknowingly reveals a part of the body that is supposed to be covered, or if she wears a garment that she’s not supposed to wear (even if she doesn’t know that she’s not supposed to wear it), like shorts or pants or a too-tight outfit; then according to the Halacha, she is in violation of Tznius, no matter how nice a person she is.
An “Isha Tzadekes” is someone who keeps ALL of the Mitzvos that a woman is supposed to keep, including Good Middos AND Tznius.
For example, if a Jew was raised without a Jewish upbringing and is a kind person, but he violates the Halacha of Shabbos; is he a Tzadik?