What we do know is that Laine was a massive dick growing up and had very poor reputation in Tampere in youth hockey, culminating of course in his middle finger death threat episode in Hlinka 2015.
As for direct bullying, shrug. Haven't heard so, but it would be the least surprising thing in the world. I went to school with a national-level athlete and if Laine's attitude was even close to his(which it seems to have been judging by rumors, documented incidents, etc.) then I'd be more surprised if he was not a bully.
I do agree that Scheifele-Wheeler were the problem in Wpeg, though. Laine aside, Byfuglien doesn't just suddenly retire while leaving 6mil on the table for fun, and Maurice's comments about some players just being so good that they don't need coaching...