Nike — the company that built its entire brand on “Just Do It” — just did the opposite. They slapped a giant sign in the window of their Newbury Street store in Boston, just a few hundred feet from the marathon finish line, that read: “Runners welcome. Walkers tolerated.”

Then everybody got mad and they ripped it down faster than you can say “quarterly earnings call.” Classic.

Now look — we need to talk about what actually happened here, because the layers of irony are so thick you could insulate a house with them.

Nike, the corporation that stood behind Colin Kaepernick while he knelt on the American flag and told us we needed to “believe in something, even if it means sacrificing everything” — that Nike — just told disabled marathon runners and para athletes that they’re merely “tolerated.” The company that spent a decade lecturing America about inclusion and equity decided that people who walk during a marathon aren’t real athletes.

The sign was up for about a week before the Boston Marathon. It didn’t take long for Robyn Michaud — a five-time Boston Marathon qualifier in the adaptive division who has a spinal cord injury and takes walk breaks during the race — to post it on Instagram with a message that basically said, “Thanks for tolerating me, Nike.”

That post went nuclear. Hundreds of videos. Thousands of comments. Every runner with a functioning internet connection saw it and thought the same thing: what kind of arrogant corporate garbage is this?

Nike folded like a lawn chair at a tailgate party.

Their official statement was a masterpiece of corporate cowardice: “We want more people to feel welcome in running — no matter their pace, experience, or the distance… One of them missed the mark. We took it down, and we’ll use this moment to do better and continue showing up for all runners.”

“Missed the mark.” That’s corporate-speak for “our marketing team is getting screamed at in a conference room right now.”

They swapped the sign for a new one that reads: “Boston will always remind you, movement is what matters.” Which is the most generic, say-nothing, HR-approved sentence in the history of the English language. You could put that on a greeting card for someone’s knee surgery.

But here’s where it gets really fun. Asics — Nike’s competitor — saw the fumble and pounced. They threw up a billboard near Fenway Park and the marathon course that read: “Runners. Walkers. All Welcome.” Even Ecco launched a “Walk your walk” campaign. Nike’s competitors are literally using Nike’s own stupidity as free advertising.

(Somewhere in Beaverton, Oregon, a Nike marketing VP is updating their LinkedIn profile. We’re sure of it.)

This is what happens when a company spends so many years huffing its own fumes that it forgets how normal people think. Nike got so used to being the “brave” brand — standing behind controversial athletes, running political ads, telling everybody else how to think about social justice — that they forgot the first rule of business: don’t insult your customers.

They told a woman with a spinal cord injury that she’s “tolerated.” At the Boston Marathon. The race that literally exists because of the spirit of perseverance. The race where people push wheelchairs across the finish line and the crowd loses its mind every single year.

And they wonder why the backlash was instant.

We’ve been watching this pattern for years now. Corporate America gets drunk on its own self-importance, says something condescending and stupid, then scrambles to apologize when normal people push back. Bud Light did it with Dylan Mulvaney. Target did it with the Pride merchandise for toddlers. Disney did it by picking fights with Florida parents.

Every single time, the playbook is the same: make a splashy progressive statement, get hammered by actual customers, then issue a groveling apology and pretend it never happened.

Nike used to be about athletic excellence. Now they’re about not offending anybody on Twitter for more than 48 hours. “Just Do It” has officially become “Just Undo It.”

The marathon happened yesterday. Runners and walkers both crossed that finish line. And Nike’s original sign is in a dumpster somewhere on Newbury Street, right where it belongs.