Some Russians get offended when people say the Rus and Rurik were Scandinavians, and not Slavs.

Not quite offended but there's a strong school of thought called Antinormannist school based that argues that Rurik and the Varangian Rus (Rugi, Ruzi) were western Slavs from Arcona on the Isle of Ruyan (Ruegen). So, they belonged to Vendi-Luticzi. That school has existed since very beginning of real scientific discussion of origin of Rus and had such strong supporters as Lomonosov and Karamzin.
The substantiation of the case is also profound. :)