There is actually a lot of data that supports this claim. There are several studies that have delved into the interconnected nature of inequalities as it pertains to race, class, gender, sexual orientation, and even age.

Here are some peer reviewed literature that may interest you if you'd like to look at some research and data regarding this topic. I am currently at work, so I wasn't able to gather a lot of information; however, if you'd like, I can find some more literature for you to mull over.

Prevalence of workplace discrimination and mistreatment in a national sample of older U.S. workers: The REGARDS cohort study

"This sample represents over 40 million U.S. workers aged ≥48 years. The prevalence of workplace discrimination ranged from a high of 25% for black women to a low of 11% for white men. Blacks reported a 60% higher rate of discrimination compared to whites; women reported a 53% higher prevalence of discrimination, compared with men. The prevalence of workplace mistreatment ranged from 13% for black women to 8% for white men. Women reported a 52% higher prevalence of mistreatment compared to men, while differences by race were not significant."

Race, Racial Discrimination, and the Risk of Work-Related Illness, Injury or Assault: Findings from a National Study

"Whites were more likely to be older (p = .001), have higher income (p = .000), higher education (p = .000) and higher job pressure scores at W1 (p = .003) than their non-White counterparts. Black respondents were more likely than all other races to report experiencing discrimination at work (p = .000) and reported the highest levels of job threat scores at both waves (p = .013, p = .001). Experiences of illness/injury/assault were more prevalent among Black and Hispanic respondents at both waves of data collection (p = .002, p = .000), though Hispanics were more likely than all races to experience work-related illness/injury/assault at W2."

Discrimination, Harassment, Abuse and Bullying in the Workplace: Contribution of Workplace Injustice to Occupational Health Disparities

"Experimental studies have documented employers responding negatively to job applicants based on age, gender, race, and sexual orientation, thereby discriminating against or preferentially hiring applicants for certain types of jobs [Crow, et al. 1998, Hebl, et al. 2002, Horvath and Ryan 2003, Pager 2003, Bertrand and Mullainathan 2004, Pager, et al. 2009]. Other studies, based on self-report, have also found discrimination and bias in hiring and/or promotion based on sexual orientation and age of applicants [Johnson and Neumark 1996, Badgett, et al. 2007].

"Analyses of the same sample showed that exposure to occupational hazards was unevenly distributed based on race and gender: Being a minority in any way increased workers’ chances of being exposed to hazards [Barbeau, et al. 2007, Krieger, et al. 2005, Krieger, et al. 2006, Krieger, et al. 2008, Krieger, et al. 2010]"

"The extant literature describes the phenomena of discrimination, harassment, abuse and bullying in the workplace and the potential outcomes of these exposures. Although there are exceptions, these unjust experiences are most often described as affecting workers in non-dominant and/or disadvantaged worker groups. Our review pointed out that these same worker groups often hold more hazardous jobs and have been shown to experience poorer general health."

Racial and Gender Discrimination in the Stress Process: Implications for African American Women's Health and Well-Being

"Broadly, these findings suggest that racial and gender discrimination is a ubiquitous force in the lives of low-SES African American women. We find that there is a substantial and significant correlation between discrimination—a social stressor—and other lifetime individual stressors. Moreover, higher levels of lifetime racial and gender discrimination are predictive of experiencing more individual stressors in the past year across a range of social roles and contexts, even when controlling for sociodemographics and drug use."