No, @hnarn is right. And you don't really "get" this until you start maintaining an OSS repo (I speak from experience). For years, I was very critical of Linus Torvalds and his brusque attitude. Then I started a few moderately-popular OSS projects, and the entitled masses started pouring in.
After a while, it's hard to refrain from telling people to just screw off.
I think this is one of those cases where one might say the customer (or user, in this case) is always right. But there are always customers who will just find something to complain about, and often (like when the product is a free community service) they're simply not worth having as customers.
edit: Personally, I've been a heavy user and supporter of CentOS but I've almost never referred to it as CentOS. Because the point is to be binary compatible with RHEL, and it's then naturally almost the same thing as Oracle Linux and Scientific Linux, etc. So I would simply refer to "EL5" or "EL6" in code or other places. This probably won't be any different.
After a while, it's hard to refrain from telling people to just screw off.