I ask them. We have allowed Hispanics into our formerly all Germanic heritage family for over thirty years now. It's only in the last two years we've opened up to the Irish and Israeli's. So it's simple. You ask them or engage in conversation.
Of course one needs to be around Hispanic surnamed people to do that. But, then on the West side of San Antonio, and almost everywhere else in San Antonio one can find someone with a Hispanic surname if they try hard enough.
Remember my qualifier was, the ones I meet.
That's fine. We all have our own experiences that shape our opinions one way or the other. Just remember though that Humans are by nature tribal and when they perceive , rightly or wrongly, people like themselves being mistreated they may take it personally.
I will say this there is no doubt that Hispanic Americans are against illegal immigration. The problem is that there is disagreement about how to do it. Most Hispanic Republican groups have come out for the Presidents plan and also tough border enforcement. The Republican Hispanic assembly etc.
However, I am getting a feeling from many Hispanic Republicans that they are getting a tad tired of not having their views heard. Including the head of the Texas Hispanic Assembly chapter that in comments he has made over the weekend, after he and others attended the Texas Republican Convention. This is a guy that supports getting rid of Birth Right Citizenship I believe and is no radical. Of course I think you were there and can give greater insight into that perhaps than what I read in the Sat and Sun Texas media.