Those studies seem pretty weak to make a blanket statement like that. There are two things I would need to know more before finding these studies credible.

1. What were the difference in reaction times, are they actually far enough apart to lend credence that there is a preference?

2. What “gay” porn did they show them? Gay, can also mean two women, which is a normal fetish for straight men. If it was only two men in the gay videos then there may be something there, but they don’t reveal the content of the videos.

Even if all these studies are as sound as you claim, what percentage of homophobia comes from this suppression? It doesn’t say, but probably a small amount.

Which still leaves us making big stretches and grand accusations on flimsy ground.

So again, this is a little nuts. Pun intended.