That is absolutely fine. Many people in the Open Source community go out of their way to make sure they are not thrown into the free software bucket. I think the feelings here are mutual.
Citation needed.
There are people who think that "free software" is the loony bin and absolutely refuse to be associated to it. There are examples of that in this HN thread. There are also people who call themselves "free software" and disagree with the FSF, although they don't disagree on what "free software" means. OpenBSD is a clear example (look at their release song lyrics).
Asking people to change license of an existing project is quite demanding and takes more effort that doing nothing which makes it an unfair comparison.
I would say the majority of developers who are writing Open Source code go out of their way to ensure they are not touching GPL code.