I bet no-one has any grudge against Sweden what comes to some historical oppression.
If there is some grudge it's mostly about ice hockey or people being forced to learn Swedish in their teen years at school (and that's purely out of laziness - or at least it was for me and my friends as we just didn't want to do the work to learn a new language).
Finnish people used to joke that "all Swedes are gay" and I still have no idea where that came from. It was some sort of a "meme" decades ago.
Finnish people don't really care if their entertainment comes from Sweden or anywhere else. Swedish pop music has been amazingly popular in Finland for ages now. I personally am a huge fan of Army of Lovers.
I spent some time in Finland and despite the historical oppression, the anti-Swedish sentiment seemed like a big joke, like how Americans give Canadians shit simply for not being Americans. The two countries are joined at the hip - even the stops on the metro are in both languages. A lot of families I was introduced to had Swedish last names. It's more like a sports team rivalry than anything.