I lurk on more forums than I would ever join partly because of that issue.
Was reading through a thread on a tarantula forum the other day, and the old hands were complaining how newbies use common names for their spiders, and somehow worse, they will use both the common name and the Latin. God forbid, a newbie mistakenly capitalizes the species part of that binomial. A few pages later, the thread devolved into a free for all making fun of people for their Latin pronunciation.
Wow. I felt like we should be holding delicate tea cups with our pinkies extended.