This is not the question that needs to be shown; while parent comment is indeed a single mom, she cited sexism as the obstacle. This is not necessarily due to her particular circumstance as a single mom but may refer to discrimination that all women face.
Sexism is easier to show, due to the intense research on it. Not knowing a priori her experience, every year research comes out of some think tank about gendered discrimination in the workplace; a google search should return results.
During my time as a single dad, I began my career in in programming. I started working for others. I now work for myself. In that time ...
- Zero female superiors have asked me on a date.
- Zero female coworkers have asked me on a date.
- Zero female coworkers have commented on or complimented my appearance--I'm no Brad Pitt, mind you, but I also don't look like someone took a hatchet to a picket fence. The closest I've gotten to a female commenting on my appearance is someone saying she thought I looked a little like Mark Wahlberg.
- Zero comments have ever been made when I've shown up late due to something kid-related (like school being delayed and dropping them off at school 2 hours later than normal).
- Zero comments have ever been made when I leave earlier than everyone else for something kid-related (like picking them up from school).
- Zero comments have ever been made when I've missed entire days due to something kid-related (like a kid being sick, or a school holiday (which I've always taken as work-from-home days so I could be with them)).
- Zero comments have ever been made when I've taken a break mid-day to attend a school function. I do the function, come back asap, and get back to work without a hiccup.
- I've never been asked if or how kids (or being a single parent) might impact my work.
- I demand a higher salary explicitly because I have kids to support, want to provide them a good life, and I have never had that questioned.
- I have never once been asked to compromise when I say I cannot do something because it conflicts with my parenting, my kids' activities, or something I've planned to do with them. When I say I have something to do with my kids, that ends the conversation, because I do not have a partner who can do these things and they know this.
- I have never once had a client question if my kids will get in the way of 6-figure contracts.
- I have never once had a client complain or ask me to compromise when I decline to do something or cannot get to something because it interferes with my kids or parenting.
- I've never been denied a raise when I've asked for it, despite the fact that I openly do not compromise my time with my kids.
- I have never been denied a promotion when I've sought after them, despite the fact that I openly do not compromise my time with my kids.
I could continue to dig deeper if you'd like.
~ Do you have any evidence showing single dads get better treatment than single moms?