Dutch
"Syčák" is a Czech surname, so it is likely of Czech nationality.
Bad attitude has no nationality, it is a human trait. All human populations have people that have good and bad attitudes, personalities and behaviors; some individuals have more of one and less of the other. Most of us humans are some combination. To believe that a specific nationality has the 'most bad attitude' is a very bad attitude indeed.
I have not had this experience having met several thousand people over many decades. If someone did introduce them self to me including their religion or nationality, it would lead me to believe that they considered that an important part of who they are, of how they see themselves.
John Holland's conclusion in his personality type theory was that there are six primary personality types, and individuals tend to gravitate towards certain types based on their interests and abilities. He believed that people are most satisfied and successful in careers that align with their personality type.
Attraction is subjective and varies from person to person. It's unfair to generalize based on nationality.
Jan Vermeer was Dutch, born in Delft, Holland.
dutch
in Holland
Holland
Tom Holland is English and British
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There is a Dutch "Cronkite" variant found in North Holland...
Dutch; the meaning is: "from the town of Winkel, in Holland".
The Dutch surname of Taker is first found in South Holland.
Stephen Holland - artist - was born in 1941.
Nate Holland was born in 1978.
Dominic Holland was born in 1967.