Not necessarily, I looked on YouTube out of curiosity and found just as many running in one way as the other. I think the early ones like in the game might have been designed to run long end first, only changing to short end first when the ‘low nose’ model came out later on.
Anyway, front or back, diesels are designed to be driven either way and often would run ‘backwards’ as it’s simply not worth turning them round.
I find it funny that you can get angry about something so small and yet seem oblivious to the fact that trains DO NOT simply flip end to end at the end of a line like they do here. What’s more unrealistic or in your words, ‘ridiculous’, that or a diesel running backwards?