In that context, dianavan, "subspecies" is not in reference to human beings - at least not any still in existance, since there are currently no recognized subspecies of humans in existance today. In the context of that dictionary definition, the term refers to plants and non-human animals.

But to deny only Muslims the ability to use protective language while all other groups have such language as protection has the effect of being discriminatory. So until you can come up with a way to provide such protection to Muslims, you are helping to promote discrimination against Muslims when you try to discourage the use of the term "racism" to refer to discrimination against Muslims.