History /
Polish hatred towards Jews... [1290]
That has nothing to do with the attitudes of the regular people (no one asked them either) in that period or later. And when Poland gained independence after WWI, anti-Jewish feeling hit an all-time high. I don't see how anyone can deny this. With all due respect to today's Poland, it was not warm and welcoming to Jews since about the 17th century.
Attitudes of the regular people were varied in time,place and often depended on personal experience.
This is two way street often anti-Jewish feeling were not without a reason.
Generally speaking period after Poland regained Independence nationalism were on the rise.
Every groups and minority were regarded from the point of view of it contribution and loyalty towards state.
Because antebellum Jewish minority were varied politically and their loyalty as a whole were rightly questioned and there was also economical issue.
To conclude, your generalization about not welcoming Poland is all wrong.First of all Poland were home for Jews for many generations, and like for many others (non-Jews) hardly were warm or welcome, its was home for better or worse.
There was one factor however which make things complicated, Jewish population as a whole didn't assimilate. They separated themselves from society to the extend that living in Polish state didn't learn language, others were building communist or socialist Jewish parties and of course many embraced Polish culture.