I've seen all sorts of things around the internet... most of them contradicting others.
First, the idea that all pagans believe/practice in the same way, when of course we do not. This is one that I even see coming from other pagans (who generally think "neo"Wicca is the only pagan tradition), so that doesn't help much.
I'm pagan, so I'm a Wiccan (I must follow the Wiccan rede, I must cast circles, I must worship a God and Goddess, so on), I'm pagan so I'm into new age stuff, I'm pagan so I'm a Satanist. I'm pagan so I must literally worship the earth, sun, moon, whatever... (Guess that goes back to the first, yeah, I know a few who do... but we don't all.) I'm a pagan so I must not believe in any God, so I must hate the Christian God, so I must hate Christians.
That pagans are all hippes, vegans, pacifists...
That pagans are all sex-crazed, have monthly orgies, that we have no morals, that we do blood sacrifice (and we'll steal your cat for that reason), that we drink blood - yes, even the rumor that we sacrifice humans (usually good little Christian children/babies) is still going around in this day and age.
There are tons of misconceptions and such about every religion/group out there. This is why it's best to actually listen to the person you're talking to, to get your information right from the source, rather than assuming...