That’s interesting to see that the words are considered pure synonyms by that reference source.

I’ve always used Oxford or Cambridge for my definitions,

Vindictive

having or showing a wish to harm someone because you think that they harmed you; unwilling to forgive

Vengeful

expressing a strong wish to punish someone who has harmed you or your family or friends:

Revengeful

While both vindictive and vengeful are synonyms of revengeful, Cambridge notes that there are different tonal applications (vindictive is a disproving synonym)

So I guess at the end of the day whether you think women are vindictive depends on your definition of vindictive. I can’t break away from the definition I’ve always known, that vindictive is revenge for a perceived injustice and is a disproving judgement. Therefore I don’t think women as a whole are vindictive because I don’t think the injustice is perceived, it’s real and tangible.