I think many players don't know that playing the game with headphones makes hunting so much easier. Therefore they wonder that you are able to spot them so easily while they have problems spotting you.
Apart from that it's clear that after playing the maps for a while you become aware of which objects usually belong to a room in the map and which do not. When entering a room you notice unusual objects at once and therefore already know which object is a prop before the prop makes a taunt sound. I think this makes many novice players think you were cheating.
I think different rooms for beginners, advanced and pro players would make playing more fair and more fun for everyone. But I understand that the developers don't have the time to add more features to the game. So the players who are accused of cheating just have to continue to explain themselves.