Getting paid for your work isn't necessarily antithetical to developing free software. Free means free as in cost and freedom for the end user, not as in free of compensation to the developer(s).
For example, Blender is free software, yet the Blender foundation's Development Fund brings in about a quarter million dollars monthly in donations to fund the actual development of the project.
I will say though, I certainly don't agree with the original point that "the only 'nice indie software' is free software." There are great indie projects that you can pay for, that still aren't exploitative, just as there are indie and corporate projects that are exploitative. I just think there's a higher likelihood of something funded through personal care and goodwill from a developer, or user choice (e.g. donations) being good to the end user, rather than force (e.g. keep paying us monthly or you can no longer open your project files)
If you really think about it, skirts can actually be more comfortable for males to wear than for females considering the shape of their body.