I'm not sure what your travel experience is like CJ but mine has been nothing like you describe.
Well, we all have different experiences.
Been to Tijuana about seven times; to Acapulco once, with the Navy, believe it or not. A week's liberty there.
Been to pre-takeover Hong Kong; to Singapore; to Perth and Hobart. Plus, talked a lot to senior enlisted about how life was in the P.I. before Subic was closed. Also talked a lot with East Coast Navy types, about how life was in Rota, Spain, in various ports in 1980s Europe.
I was scoping out Mexico as a retirement home before the Plandemic hit...my luck, and I mean that. I could have been stuck behind there, and some Mexican states were not overly kind or gentle with their Jab Mandates.
I'd talked a lot online to people I believe were Americans (never met one face-to) in Mexico; they gave me some advice on how to work through Mexican customs with my motorcycle; and what to expect, and where not to go where my money would be burned up. Also, Unca Walt - who basically pulled some things together. My own conclusions: They love our money; they love that Americanos can pay for things, without thought; but when the money's gone, it's Us-Versus-Them time.
There's even some of that in the States. In 1981 I was in Texas - never having been there; this was before my Navy time. A lot of Detroit types were moving down there - they called the Northern migration the Black Tag Plague. For the black Michigan license plates of the time. Didn't matter where you really were from; if you talked funny like a Damyankee, you were a Black Tag.
And they circled the wagons. My first encounter, close up, with a Harris County cop, was when he was breaking my face with his mother-of-pearl and chrome revolver. While apologizing to a guy who started the disturbance, a good ol' boy who sucker-punched me, cold-cocking me. Mistaken identity on his part. But he was a Texas son, and I had the funny accent, and that was all the cop needed. Why bother to arrest me, and maybe see me released in a couple hours, when he could put me in hospital for a day? Which is what happened. And the cop didn't take me there, either. I had to get myself there.
That's Them-Versus-Us. I'd been close-to-jumped by Mexicans (looked like actual Mexicans, you used to be able to tell) in San Diego, walking back to the ship from the San Diego Trolley stop. What saved me was, he thought I was going for a sidearm. I was reaching for my key-chain, aiming to take a stand and dig his eyes out. He ran like hell, after stalking me for ten minutes.
We and They.
I'm glad you saw a different side to life in other nations. I have not. You will say it's personality, or ignorant behavior on my part...you may well be right.