Non-White models being 4.5× more likely to be plus-size suggests casting directors still associate thinness with "mainstream" beauty while relegating diversity to niche categories.
possible, but the stat doesn't prove the causal story. A 4.5x ratio could also reflect that the plus-size category was built largely around Black and Latina consumers (who statistically have higher average body sizes in the US), so brands cast to their actual customer demographics...
Men get judged plenty: height, hairline, weight, income. The 'we don't judge men' line only holds up if you've never been a short or bald guy on a dating app. Plus-size male models already exist (look up IMG's Brawn division); the industry just hasn't bothered to scale it.
Bald women wear wigs and there's no comparison between short women and short men. I've never heard a man complain about a woman's height being too short and being bald seemed to have a positive effect on a woman I knew as she attracted attention with her differing wigs.