Boss of my sister, who’s an American lady, visited my country. Just on that base I could tell she’s left leaning, because I don’t think republican would want to visit India. It might sound trivial, but I really thought, how much do Americans really have a choice in election? No, it’s much harder to do it here, tell someone’s political leaning just by looking at their lifestyle.
Not sure why you’re getting so much shit for this! Because of how polarized the US is, people do a lot to telegraph their leanings one way or another, either through style or speech hinting at what they believe. A lot people make it pretty easy to tell their political leanings quickly.
Also, Democrats are a fair bit more likely to have a passport than Republicans, so if you’re meeting someone abroad, adds are somewhat higher they don’t support the current shitshow.