When my older children were young we decided to omit certain words from our family vocabulary. Words like "stupid" and "shut-up" we felt weren't respectful of each other and shouldn't be used toward each other.
On one particular day I was frustrated with something and called it "stupid". Oh man, my children were indignant. They didn't differentiate between things and people and were convinced that my behavior didn't match up with our established expectations. And when they went to church the following Sunday they reported my bad behavior to their teachers - "my mom said the 's' word!"
Luckily for me, I learned to control those words, even toward things, and their trust in me was restored. Though this may be minor on the scale of moral mishaps the idea of hypocrisy can be very destructive. Before we continue I like to define the critical words in the conversation so that we start out on the same terminology page, so to speak.
the practice of professing standards and beliefs contrary to one's real character
a pretense of having a virtuous character contrary to actual behavior
a pretense of moral or religious belief that one does not really possess
a pretense of having some desirable or publicly approved attitude
an act or instance of hypocrisy
To sum up, hypocrisy is practiced pretense. At times kids, teens in particular, have a real problem with their parents because of this practiced pretense or hypocrisy. Parents who don't act as they preach fall into this parent trap. The integrity trip-up, hypocrisy. And teens hate hypocrites! It doesn't have to be "major" deviations from professed piousness, minor detours will accomplish parental captivity. For those of religious belief, we automatically set ourselves up. We are preachers of something and when we fail at what we teach we are by definition hypocrites.