For example, if a chain-smoking teacher cautions a pupil for smoking, that warning is self-contradictory.

Conflicting reports prompted the director to reconsider her position.

He isn't consistent with himself.

His voting record is riddled with contradictions.

What he said yesterday was not in accord with what he said last week.

His behavior conflicts with what he says.

His actions always contradicted his word.

His argument is inconsistent with our policy.

The results will not contradict the theory.

Your story doesn't corroborate what I've heard before.

Your behavior is in conflict with your principles.

Our diplomacy and strategy ran in clear contradiction to each other.

It is that Emmet's theory is compatible with previous theories in physics that is of most significance.

It's a bundle of contradictions.

Love is a great contradiction. You cannot live without it but at the same time you will be hurt by it.

Wanting to improve your expressiveness, but not wanting to express it is a contradiction from the beginning.

There are two contradicting emotions within the human heart. Needless to say, there isn't a person who doesn't feel empathy towards other's misfortunes. However, when you see a person finally able to overcome their misfortunes it is possible to feel a sense of dissatisfaction. To exaggerate a little, it leaves you with a sense that you want to see that person fall into the same misfortune again. Before you know it you unwillingly harbour a sense of hostility towards them.

I find it contradictory that the same sentence, when used by a native speaker, is automatically OK, but not when used by a non-native speaker.