I grew up in a mostly (75% or so) Hispanic neighborhood and I don’t think I’ve ever heard the word “gringo” in a non-derogatory tone of voice or context. And perhaps sympathy was not the correct word to have used there. I think “empathy” might better convey what I meant as it is my assumption that you are trying to convince people to see the situation from your point of view. Asking someone to empathize and/or agree with your viewpoint does take some diplomacy in many cases, and demanding evidence that is likely not in a language the commenter speaks is not going to be very helpful. While Mexico is an important country with a large population and substantial global economic impact, any news about Mexico that reaches the US in English is unlikely to present the internal politics of the country in a nuanced or detailed way.