They are talking about the tone of the message. "it shouldn't be this hard" is not the proper way to report a bug at least not in a neutral way. It has the intention to make the maintainer feel bad and increase the likelihood of a change. And that was just in the title.
And yet, "it shouldn't be this hard" is an incredibly pertinent observation perhaps with the intention to make the maintainer understand that offloading tons of work on many other people has an impact.
