Happy Cultural Appropriation Day! (EDIT)

Not a topic I thought I'd be citing CNN for, but...
Cinco de Mayo: What it is, and what it isn't - CNN
Includes this fact-bomb:

When was the Cinco de Mayo war?

There was no Cinco de Mayo war.

The holiday celebrates Mexico's victory over France in the Battle of Puebla on May 5, 1862. It was a relatively minor battle -- the French reclaimed Puebla a year later -- but a symbolic one because a small Mexican army defeated a larger occupying force. By 1867, Mexican troops had driven France from the country.

Many Americans assume Cinco de Mayo is Mexico's Independence Day. It's not. That holiday falls on September 16 and commemorates the Grito de Dolores, a priest's ringing of a church bell in the town of Dolores in 1810 that triggered Mexico's War of Independence from Spain.

This is a slightly less face-palmingly stupid question, what with a commercial currently running for a Mexican cerveza that refers to "The Battle of Cinco de Mayo." Complete with footage of a bartender polishing glasses in the middle of the battle. (If there was a bartender at the Battle of Puebla, he was a French quartermaster doling out the vin ordinaire ration to les soldats.)

EDIT:
Ugh. I've been making fun of people that think Cinco de Mayo is a huge Mexican holiday for years.

The fun has gone out of that,though, now that I've discovered that the Southern Poverty Law Center (which has precious little to do with either poverty or the law, mostly seeming interested in accusing conservative institutions of being hotbeds of racist terrorism) has condemned Cinco de Mayo as cultural appropriation.

Damned progressives, always ruining everybody's fun...