You should really reconsider this blithe view towards the prefixing of "GNU/".
Within the faithful fold, where you are apparently spending most of your time, you may view the prefix as without charge, and thus as something to use descriptively, playfully, as well as in the course of promotion. In the larger world, however, as you have seen, this prefix is a highly charged issue. The goal of mentioning the GNU project where its works are used and relevant can easily be accomplished without resorting to affixing its name to independent software projects. If you honestly wish to simply give the GNU project mention, then do that.
Every time I see the prefix "GNU/" attached to an independent software project, I am not reminded of the goals and noble ideals of the Free Software Foundation. I am instead reminded of the rigidity and unwillingness to listen or compromise of the organization. I suspect this is similar for many people who encounter Linux first, and GNU later. While I would be ecstatic if the FSF would learn to compromise (not their ideals!) on practical matters with other members of the free ecosystem, and to appear less rigid, I would be pleased as punch if the FSF would simply cease reminding me of these weaknesses.
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