Standard immigrant-hatred. Very much en vogue throughout Europe right now.
All of these are covered in all the major news sites. The poster your responded to belongs to our equivalent of Trump supporters, meaning that, yes, there is a tiny bit of truth in what he's saying (there are some minor problems with violance and rape amongst the refugees) but the extent is extremely exaggerated and fueled by nationalism, paranoia and xenophobia as well as a complete lack of care about the truth.
https://www.bra.se/bra/brott-och-statistik/valdtakt-och-sexu...
Here you can see some stats that shows the real statistics, and as you can see the levels are stable. Please note also that this isn't only for rape, but all kinds of crimes with a sexual component (i.e. everything from groping, spreading nude pictures, sexual harassment etc).