I had X food last night

Some people I know will refuse to go out for X (Chinese, Thai, Mexican, etc.) food if they've done so in the past week, say. This has always struck me as weird, as if a whole genre of cuisine -- one that many people eat three times a day[1] -- can be lumped together as a single exotic thing to sample once in a while. These same people of course have no problem eating 'American' food all the time, and often have the exact same meal every day for breakfast...

Brought to you by my having cheap Thai food almost every day for the past week.

[1] I think it was Calvin Trillin who pointed out that in China, a billion people have Chinese food every day.