I like the international servers, since it means that peak times will be spread out some (things might sell overnight, etc...). It also gives me a little more reason to brush up on/practice my Japanese, since I've forgotten most of it by now. Sometimes though, I just don't want the hassle of trying to translate, and would prefer just to speak in English. I'm sure many Japanese people feel the same way; it's not always xenophobia, sometimes it's just a hard day at work with the following mental exhaustion. I've also heard that some Japanese feel like their English isn't perfect, so they hesitate to speak it, while others don't speak much at all. I know I was taught Spanish for 4 years in high school, but can't do much beyond ordering beer and counting.

As for the red mobs... "Akai mono dake onegaishimasu" might work. It doesn't always have to be a perfect sentence to convey the meaning.