I know the term Wicca is used very loosely by many these days, but I consider Wicca to be a specific set of traditions, with specific practices and beliefs attached. Things like following... a god/goddess pair, using the specific Wiccan ritual structure (casting a circle, and all that), Wiccan tools, Wiccan ideas like the rede and threefold law, the wheel of the year - often with a specific Wiccan mythos (since none of the holidays originated with Wicca, they are pulled from older pagan religions). And of course more, or maybe less, depending on the particular tradition of Wicca one is looking at.I see so many people say, oh I'm a witch, but I'm not a Wiccan. What makes you not Wiccan?
I personally follow none of those beliefs or practices, aside from a shared set of holidays, without any sort of specifically Wiccan mythos attached. For me, shared holiday dates are no where near enough to call myself Wiccan - especially since the things I do do, put me squarely into another tradition. Other religions share ideas, like Hinduism and Buddhism have ideas of karma and reincarnation, or the Abrahamic religions share holy texts and the like, but they are not all the same religion. A Jew is not a Muslim, despite sharing some beliefs, ideas, text, etc.
So it's not that I have something against Wicca itself, it just isn't the path I'm following.