I think I’ve done a lot of that: we don’t all practice witchcraft, we’re not all earth-based.
The only misconception I can really think up is the idea that pagans really have anything in common. I’m of the opinion that in addition to being a catch-all, opt-in term, paganism is also scene. Which means that there is a huge range of beliefs but also a huge range of involvement within those beliefs, the community, what have you.
It makes much more sense to me to engage with it as a scene rather than anything else, to be honest. That way I can interact with the mystics, the researchers, just as much as the people who love the music and the artwork. I can respect the pagany equivalents of the Christeasters as well as those with ritual calendars that leave no unsacred day as members of the same scene, rather than as a person of a similar belief system.
It’s very freeing.