The C/C++ people hate it when you call it C/C++.
That's a fairly recent thing that some people do as a kind of virtue signaling. The "C/C++ Users Journal" was a very popular publication and no one took issue with its name. Nor do people take issue with Dr. Dobbs which has a "C/C++" section with articles from highly influential members of the C/C++ community. C++ is a complex language, so people invent ways to show how dedicated they are to it, and nowadays that mea…
If by recent you mean well over 20 years ago. When I began learning C circa 2000, I used to hang out on comp.lang.c, and "C/C++" was very much frowned upon. And for good reason--people felt entitled to ask C++ questions in a C newsgroup, which was and remains a poor idea. Even if they were asking questions relevant to both, e.g. regarding pointers, it's still a much better idea to ask in a C++ newsgroup. See https://en.wikipedia.org/wiki/XY_problem
There are people (invariably young) who resist newsgroup etiquette, convinced the etiquette is pointless, or something like virtue signaling. Over the decades they eventually come around to appreciating the wisdom, even if there's never a mea culpa.
The commercial software world, and especially the Windows world, often had a much different culture than what developed online, especially in the FOSS and Unix subcultures. For the latter especially, C++ was relatively uncommon until the 21st century. C++ (with KDE, etc) and then Python had the effect of importing or creating whole new subcultures in these communities without any memory or appreciation of the pre-existing culture.