About Thai food, it is interesting to note that Pad Thai, often considered to be the national dish, was in fact made for that purpose. Originating from the mid 20th century, it is hardly traditional. That doesn't make it less delicious, and while it is one of the most accessible of Thai dishes (i.e. not too spicy), it is not just for tourists, locals eat it too.
As for getting into an argument, I would avoid getting into an argument with people whose national sport is one of the most effective martial arts. But Thai people are usually not the kind of people who get into an argument in the first place.
Why can’t something 70 years old be traditional? Most “traditional” things aren’t as old as people imagine, anyway.
The world is smaller than we assume
That is not strictly true, but the world is certainly smaller than we tend to think.
However, detractors argue that Milgram's experiment did not demonstrate such a link, and the "six degrees" claim has been decried as an "academic urban myth".’