Food? Too controversial. People start talking about GMOs, gluten sensitivity, veganism, etc.
Travel? Too much like work.
See how stupid these rules are? Talk about whatever. Or nothing. But rules about what's off limits are just ridiculous. Especially since everyone talks about work and flying, anyway, even though they pretend that they're too cool to do so.
Like I said, they're not rules, Sweetie.
Usted habla Ingles?
I'm simply not going to conduct a political, religious or financial debate in my cockpit.
You may get the:
if you're completely being a zealot, but I'm not going to verbally fence with you. You can talk about it all you want!

Knock yourself out, sparky! I may help you get yourself spooled up like:
"Obama's takkun muh GUNZ!"
"Well, what do you expect from an anti-colonial secret Muslim with suspicious allegiances?"
Just to watch your face get red and entertain myself as you dive deeper into that murky abyss of anger.
THAT, my friend, is entertaining.
"Where do you buy your gold from"
"Gold? All my money is in Unobtanium."
"How did the Suns do?"
"Oh, they got points on the board. They really wanted to win the game, winners know this, and they put the ball in the basket and put points on the board AND played a better game" (Why do you think I can do sports talk so easily without being a sports guy?

)
I'll get you spun-up, but I'm largely just punking you for my own selfish entertainment.