Violence against homosexuals is pretty common in South and Central America - which is where most of recent American immigrants are from. Here's an example from CNN[1]

"Latin America offers a contradictory narrative: The region has the highest rates of violence against the LGBT community, according to research done by Transgender Europe, a non-governmental organization, but it also has some of the most progressive laws for LGBT equality and protection."

It seems like a pretty intuitive step to me to go from "Highest rate of hate crimes" to "more likely to be homophobic".

1 - https://www.cnn.com/2017/02/26/americas/lgbt-rights-in-the-a...

Perhaps, but it also seems intuitive to me that people who choose to (/ have the opportunity to) leave a country (i.e. immigrants) may not be representative of that country as a whole.