First of all , I really love Bahraini people, they are amazing.
I believe most Kuwaitis love Bahraini people too.
In every nation you will find very few people who are arrogant and pride.
By the way Kuwaitis are very generous and welcoming people. For example the previous Prince of Kuwait Shiekh Sabah was the leader of Humanity.
Even Kuwait state also support other nations with donation and help.
I think you did not really experience the real Kuwait. Maybe you meet few people who had bad mood.
By the way even in India there few people who are arrogant and pride.
Regarding of the people who came here long time and became Kuwaitis , they came here and work hard and Kuwait was welcoming everyone because it's very peaceful and nice.
It's normal in the world people move from country to country to look for better opportunities. It's not begging.