I think so. I believe it's more of a cultural, geographical and societal influence that creates these "stereotypes".
Its true for ex. That Germans are punctual and straight to the point. Many colder climate nations too. It's debated that the coldness and harsh conditions (in place where you can die out of cold if you're left waiting or beat around the bush) contributed to this.
In contrast, warmer cultures, due to probably the abundance of warmth, food and access to nice weather allowed them to be more cheerful, laid back. For ex. Islanders are very not punctual. Especially if it's a small island. Like even the government institutions don't rush anywhere.
People in Russia don't smile to strangers. Excess laughing is considered foolish. And they're very "depressing" and always talk about heavy topics, like the heavy weather. At least in the northern cities. But it's very cultural to complain here as well. It's bonding. Talking about our hardships helps us stay resilient. Most Slavic people do that. We do it too. We complain a lot. We also always reject the first time when someone offers us something. Is seen as rude to take immediately. Will that make you more humble and down to earth? Yes.
