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.
No.
If you have less self control, you’re more likely to consume more short-form video content (duh). But correlation is not causation and the study is not proving that more short term video content is causing less self control. It probably is, but that’s not the finding of the study as the title and some of the quotes imply.