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.