[throwawaymath]

Are you being facetious? I don't think the candidate's favorite music genre is being explicitly used as a job qualification. They're not filtering on it because it's relevant to the job.

[camjohnson26]

Why would you put musical interests on your resume if you didn’t want it to be used as a filter? As a resume screener I’m going to assume anything in the resume is fair game, and there’s objective reasons to select a candidate who’s self aware enough to know that country music isn’t sending a good signal.

The fact that they like country music isn’t the problem, it’s that they thought it was a good interest to put on a resume.

[throwawaymath]

Please tell me a few of these objective reasons why someone who puts "country music" on their resume as an interest isn't sending a good signal.

As a resume screener you should calibrate your recruiting process to be empirical. What you're describing doesn't sound empirical at all.