You’re not falling into their traps. Good. But how do you confront them about their latest infraction?

If you are willing to accept an excuse, they’ll just start throwing excuses at you – deftly – until one sticks. Don’t be swayed by rationalizations. Plain and simple: judge actions, not intentions.

You need to keep the focus of the conversation on them. And avoid using sarcasm, hostility or threats. If you’re calm and polite, it’s much harder for them to say you’re the bad guy here.