Comic-Con kicks off amid period showing off fandom's ugly side

'Star Wars' fans at Comic-Con in 2015

(CNN)Comic-Con, we have a problem.

Once again, 130,000 pop-culture enthusiasts will descend on San Diego beginning July 18, immersing themselves in their favorite movies, TV and other pastimes for Comic-Con International, turning the sprawling convention into the center of the media universe.
Yet while the annual gathering is generally characterized by fans enthusiastically interacting with celebrities, a darker side of fandom has been in the headlines of late, reflecting the sort of distasteful minority that can give fans a bad name -- and might eventually prompt some talent to think twice about how much exposure they want to that culture.
In June, "Star Wars: The Last Jedi" co-star Kelly Marie Tran made headlines by deleting her Instagram posts, responding to racist and misogynistic trolling that chased her from those platforms. Her decision follows Daisy Ridley's exit from Instagram in 2016 after she spoke out against gun violence, as well as the venomous rhetoric directed at