Yeah I have heard a lot of people say this, and I remember it happening to me. It means your purity is becoming strong enough to be aware of the volitional roots of the words/actions that people do, and you can see they are mostly negative. It can be very eye openening. If the feeling is disgust, keep in mind that this implies that the same issue also still lives in you. (happens to me quite a lot)
Some frames to help you with it. Both are arguable, but both are solid and important:
1) Innumerable people have become enlightened before you and innumerable people will become enlightened after you
2) Nothing is wrong with them, they are there in that spot precisely for a set of reasons, it is all just an unfolding of events. In the same circumstances you would be the same.
And finally.... you will get completely used to it. Progress can be alienating but the further I go, mundanely and supramundanely the more part of the human experience I become. Which is very refreshing. I get to play the game