Well, US has a market share for macOS of around 20% and Europe of around 7-8% from what I can find.
I'd also wager the main culprit is the 20-30% price hike of Macs in Europe (in absolute numbers - it's even worse considering the lower wages in most of European countries compared to the US), rather than any particular dislike.
Perhaps if the EU eventually does something to sufficiently cripple Apple there, maybe Europe can be a hospitable location for a competitor besides Google to get a toehold someday either in smartphones or whatever the successor is. The duopoly sucks.
I'd also wager the main culprit is the 20-30% price hike of Macs in Europe (in absolute numbers - it's even worse considering the lower wages in most of European countries compared to the US), rather than any particular dislike.