It's an interesting question as I think personality traits can be passed on genetically at times and also heavily influenced by whatever culture someone is from but I certainly do not believe an entire race of people could just universally all have a fiery temper or anything that one dimensional.
I mean we're not talking about a family or a small isolated village we're talking about millions of people spread out over vast areas.
Like as an example the French being more romantic. This might be true in some senses but really most of us are just thinking of Paris and considering the range of peoples and cultures that actually live there, North and South of France are two completely different worlds... I'd be really hard pressed to believe that's a totally universal thing but I can also see where the idea came from.
So yeah to me there's way too many genetic variables and cultural differences for them to ever be true, so they're just cultural myths I guess based on really small observations at the very very best.
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