I grew up cheering against them. It was the team of the occupier, as simple as that. The often incredibly arrogant and condescending behaviour of their team did not help. I grew up in what was Communist Czechoslovakia, my mother was a student when she woke up in the middle of the night in 1968 thinking there was an earthquake, but it was the Russian tanks rolling into Prague.
Hockey like all sports was used as a huge propaganda tool in the Soviet Block, so it mattered - to those asking naively so often”what does the occupation have to do with sport”. Also, in a country ruled by an occupier, international sporting occasions are the only time you can stick it to them, so beating the Russians meant so much more. People were delirious with joy when we beat them in Prague in 1985 in the medal round en route to the gold medal.
Of course, after the fall of Communism a rivalry like this becomes less intense but is still there.