I attended an event put on by FailCon a few years ago. Every one of the speakers' "failures" was a humble brag about ow they bounced back from failure to achieve massive success. One speaker's failure was that he had to sell his company for only $90M.
The conference was a celebration of successful failures. I had fun, but it left a bad taste in my mouth.
Here's the thing. Real failure sucks. People you considered your friends stop returning calls. Doors close to you. You feel empty and lost. You can learn from it, but you can't celebrate it. Failure hurts. And that's OK. It's supposed to hurt.
If you can fail at something and it doesn't hurt, your heart really wasn't in it.