First thing I experienced coming back to the US was rudeness from airport security when I was trying to see where I needed to be screened for COVID, then finding out the US wasn't doing shit about it (this was February 2020, mind you). Second thing I experienced was racism as white Americans loudly complained about the POC airport employees with accents.
I regret coming back a lot, lol.
One of the crew were nice and answered my question. Idk what factors are important, but the white security guy sitting down at the terminal refused to even listen to me as I tried to ask my question, demanding I keep moving. The Hispanic man working on some security railings smiled and kindly explained that the US wasn't doing any COVID stuff when I asked him.
On that note, it was surreal coming back from China during COVID. The absolute shutdown Beijing was in as I left. Like, a week straight of near-empty metro, temperature checks, etc. Then get to the US, and they were like "Flight from China? Nah, you guys just come on in." It was also jarring to see the narrative change from "China is super evil for locking down Wuhan" to "China is evil for letting COVID spread all over the world". Honestly, coming back from China did more for my political development than any other single factor.