Wouldn't say it was upsetting so much as mind-bending...

Attended an interview with a mid-size web development agency in 2017. The recruiter fed back from this agency that the interviewers didn't think I'd had enough experience of an agency environment. I'd spent six years in the industry at this point, and five and a half of those years were in agencies. The recruiter was as mystified as I was over that one.