Concern trolling is “raising concerns” about certain issues that have little to no basis in reality and only serves to inject bigotry and bad ideas. For example, people were concerned about “the gays™” spreading their immoral gay AIDS virus all over innocent children during the 80s and into the 90s, only to learn that AIDS is spread through contact with broken mucosa membranes, which then shifted to “the gays™ are pedos” argument.