In a relative sense homophobia in the US is a small problem.
In parts of Central Africa there are countries where gay people are lynched in front of their families. That is a big problem. In the United States some people do get abused online, some feel discriminated against, and a few are the targets of hate speech and hate crimes. But there are very few fatalities and there is much less of a stigma.
Add to all this the fact that the United States has over the past 10 years become much more supportive of gay marriage; an issue which divided the US just a few years ago. Attitudes have changed pretty quickly, and while the job is not done it has certainly progressed to the point that there are more important problems in the United States today.