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It's a multi-faceted question. There are all kinds of reasons for perceived popularity and unpopularity of any given group.
Poles have swamped the UK, hence the natives aren't in love with them. There are just too many.
Poles aren't too popular with Germans due to the loss of Eastern territories after WW2.
Germans (not to mention Russians) aren't too popular with Poles for historical reasons.
Slavs aren't particularly popular in Western Europe because they are Slavs, not Western European. Nothing particularly complicated about it. The culture and language is somewhat different and different = foreign. More foreign than another Western Euro and hence a more limited understanding of and appreciation for them.
My personal opinion regarding them ranges from neutral to positive but then again I know many and am somewhat familiar with the culture.
In general I don't think there are major problems, all European nations have mutual likes and dislikes about one another.
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