I wouldn’t say it’s normal behavior in the US, but it certainly is more common than what you have probably seen in American tourists in SEA. As far as being “upfront”, there is that stereotype compared to some other cultures. In his case though he was just being a dick.

I think OP was saying that traveling opens your mind to new thoughts, not that people don’t travel because their thinking is limited.

What is wrong with the mp3 players you’re finding on Amazon? What do you mean by something better? What are you trying to get, and what are you trying to avoid?

Methane is bad, but CO2 is more prevelant and lasts longer. Of all greenhouse gases, curbing CO2 should be the number one priority as its effects last much longer.