Well, it happened to me in 1992. I was an insurance adjuster for a huge company in Calgary. Matter of fact that is why I moved to Calgary from Winnipeg to work for this company. Unfortunately, I went from a great supervisor in Winnipeg who was like a mentor to me to an absolute witch as a supervisor in Calgary. I had a personality conflict with my supervisor that went on for almost 3 years. I'll never forget I went on holidays for 2 weeks my last year with that company & when I came back she didn't talk to me for an entire day & a half only to say hello once & we all worked in groups. She just froze me out. It became unbearable to work there in the end.
During my last performance review which wasn't good, I told her the problem had a lot to do with how she treated me & the stress I was under dealing with it. She got angry & said the review was about me & not her & I disagreed strongly. I was fired 2 months later & even though I had years of experience as an auto, property & independent adjuster I couldn't get another job in Calgary. I sent out tons of resumes over the next year & a half, had a lot of interviews. I became so desperate in the end that I warned potential employees about what happened at my previous company with my supervisor as I wanted to be upfront about it. Didn't do any good as I was always second choice. I knew that it was my former employer bad mouthing me but there was nothing I could do. It was blatantly unfair but I couldn't do a thing about it. I spoke to a lawyer about it & if I launched legal action it would mean spending money I didn't have at the time. Cost me my career so I sympathize with Kaepernick but it doesn't change my opinion that he brought all this on himself. Yes, I considered it collusion as well.