Yep, you are absolutely right I shouldn't blame whole nation for a single person,but actually it's human psychology 'First impression is last impression' as I never engaged with Croatian guys so according to this psychology theory this person represented his nation to me BUT It is totally not good I was wrong but again it is human nature i.e If a guy from Pakistan will scam you as If you didn't engaged with them so your mind will automatically say "oh Pakisanis are scammer" it happens in such way but thanks for your positive response so I changed my words "although he was Croatian but it doesn't means everyone is bad everywhere as everyone is good everywhere"
On Upwork client's location is visible so I knew where is he from.