Ok guys, I'll be the first to say it...
Every time I've ever been turned down for a job was either due to a) not holding the suitable qualifications and/or experience or b) not performing well enough at interview (compared to other candidates).
I'd never be arrogant enough to say to all and sundry after receiving a rejection that it was because I was TOO good for the role. Or that it was a conspiracy based on my education/qualifications.
Getting back into work is hard and demoralising, you'll apply for more jobs and receive more rejections than positions you'll ever hold. It's the way the world works!
And no one thinks degree holders are more likely to get bored than anyone else working in an office (compared with someone who left school at 16) as is often claimed. If you can't or won't show genuine interest for the role at the interview then that's the conclusion they'll draw and you won't be offered the job.
Sorry but claiming it's a conspiracy is bullshit. It's job hunting ffs of course it's hard.