The reason that I mention this is that when this happens, it usually happens to April. The first instance that comes to mind is that instead of being honest with her and saying "Look, honey, this isn't personal and it's not that we don't like you but we're people too and we want some time to just ourselves", Elly lied about how boring their vacation would be. What Elly didn't realize is that April remembered this when she boasted about all of the cool stuff she did and probably still doesn't connect her lie with April damned near drowning. It's like how she doesn't get how talking about how great it is that she's separating Mike and Martha led to his resenting her for a long time.
The second instance was, of course, the Housening when John only thought that he'd managed to fool April into thinking that a done deal was just his floating an idea. He too is still oblivious to the fact that he didn't fool her one bit. It's why he also doesn't realize why Liz objected to the retainer he stuck in her mouth to break her of the habit of sucking her thumb: having seen them lie like sons of bitches, it was hard for her to trust her parents.