This is a bad study and was published in a mediocre journal.
Obviously if you post an advertisement looking for subjects that are gay you are going to get only openly gay guys to respond, creating a self-selected group of people. Good studies get representative samples. This is not representative.
My own feelings also disagree with the findings. I don't trust straight women more than I trust straight men. My order is straight guys, straight women, gay girls, and gay guys last. I haven't had any particularly nasty experiences with gay dudes, just feel like I naturally am suspicious of them.
"Cell phones give you cancer, 'super foods' exist, and Will & Grace is science"