No, he's not. He posted a tweet on twitter saying "i'm gay" but then he told his fans that he's not, his cousin wrote that. Even if he was gay though, you should still respect him :)
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If you've seen his videos on the website: "Youtube" you will probably see many comments saying that he's cute and hot.
Supermac18 was born on December 18 1994.
Trevor Moran came out as gay in a YouTube video on October 9, 2015
i do not know if barney is competly gay but if you go on youtube and put in evil barney backwards song then you can find out for yourself :)
Are you referring to the Kevin Alloca who works for YouTube? if so, then no, he is not.