Looking for a study I saw, maybe someone has a source

Hi everyone, a month ago I saw someone on reddit (in a discussion about gay rights) cite a study that said that straight people became less supportive to gay rights after seeing PDA between gay men. It was something like: People were asked if they supported gay rights and one group was shown a picture of two men holding hands, and the people in the group who saw the picture were less likely to say the supported gay rights than those in the other group.

I'm gay and I was having a discussion about public attitudes about same-sex couples with a straight friend and I wanted to submit this study as "evidence" for my point but I haven't been able to find it after google searching!