I think you've missed my assertion, which is that this is an example of confirmation bias. Listing examples of that confirm what I'm claiming is confirmation bias isn't saying much. What about the thousands of people coming out as gay who haven't got a history of anti-LGBT shit? Well they aren't as interesting so you don't remember them when you read such an article.
Your link is broken, but consider this: human beings are perfectly capable of hating one another for any difference, real or perceived. We don't doubt that racism is down to hatred of the other, rather than the self, we don't doubt that sexism is the same. Why is homophobia any different? Only because there is the potential for someone to be secretly gay.