There is a big chasm between offending someone’s honour and being offended by a bad word. The first offends individual dignity, which is a human right and must therefore be protected, the second is an abusive use of child subjectivism that we drag along culturally. If it is not even legitimate to be offended by the stupidity of others, even less so by a word from another. No human rights treaty legitimises being a fucking Flanders… (I refer to those who are offended by a bad word, I suppose you don’t care what they say). But, is your forum, your rules.
If you see its development inertia (which must have its reasons and data that validate it) is far from what you want, it also happens to me, but if you think about it a little, the most important factor that defines this inertia is profitability, because in the end it is a business that must grow or at least be maintained. So, if you want them to change their development priorities, and improve things that already work in a certain way or update that old user experience, that have a lower feedback for them, you shouldn’t be against them looking, in case they do, for more income, because you’re hardly going to get one without the other. And you will get even less by disrespecting them. The license that you have acquired says that you buy the software as it is, and at least they give you the tools to develop it yourself or pay someone to do it.