I'm a very assertive person. But I still make the mistake of only making my wish heard once. When one of my parents call me (and I'm an adult) they urge me to do this and that, nag nag nag, things that doesn't affect them. It sickens me.
I would never do that to other people out of respect. I told them once to stop it. I realize now, in their world you have to say NO as many times as they nag.
I don't WANT to do that. I don't want to be on their crappy level.