@centrox,
Well, adorning a Virgin Mary with lipstick is something I could do. The point (as I would see it) would be to push back on a pervasive religious culture that equates virginity with moral purity. The Virgin Mary myth* is anti-sexual and thus anti-life.
If one assumes the tagging of Joan's statue is serious and first degree, the question becomes: what does her representation stands for, that the tagger objected to?
In France, it stands for 19th century-type French nationalism. The kind of nationalistic spirit that led us into the first world war. Joan was heroeized (and also beatified, if memory serves) centuries after her death, during the 19th century, to support a nation-building vision. That symbol is why the National Front has tried to connect with her image.
I don't think many Americans happen to know that though. Very few French know it... So it is IMO highly improbable that the people who tagged her statue's piedestal had an anti-French or anti-nationalist message.
I think it's much more likely that someone wanted to mock the "teer down confederate statues" meme; to show how far into ridicule such drive to bring down old relics can go, if allowed to thrive unchecked.
* Mary was not a virgin anyway, according to the gospels, since Jesus had a number of brothers.