The reality is that someone who has 50 applications on his table and wants to invite 5-10 for an interview for 1 position is looking for easy ways to narrow them down.
Reality check. Look at the prevalence of tattoos. Think that the prejudice against that has diminished? As far as I can tell, it's gotten worse.
Before, tattoos were sufficiently rare that if somebody had one who was applying for a job where they were unusual, they generally were given the benefit of the doubt (ex-serviceman, gang member who got out, etc.).
Now, they're so common that they're used as a proxy for "lower socioeconomic status" and all the discrimination that comes with that.