The 17-year-old Canadian musician posted a series of Snapchat video to clarify his sexual orientation, reported E! online.
"So I don't usually do this and bring up problems, but I was on YouTube just watching some of my interviews, and I was going down the comments and noticed a lot of people were saying that I gave them a 'gay vibe.' First of all, I'm not gay.
"Second of all, it shouldn't make a difference if I was or if I wasn't. The focus should be on the music and not my sexuality," Mendes said.
"I'm not frustrated because people were saying that I was gay at all. I have no problem with that, because it wouldn't make a difference to me.
"I'm frustrated because in this day and age people have the audacity to write online that I'm gay as if it were a bad thing. That's all I really have to say about that. I just wish those one percent of people would grow up. I love you guy," he said.