HI 5min,
Great questions. It's always hard to look at ourselves. I like what
valet says in that it may be a combination of both. Passive aggressive behavior comes from fear of saying anything to make waves but being angry about something that you aren't speaking up about. The way to combat that behavior in yourself is to muster up courage and say it.
And it can be really scary the first time you try to say what you've been feeling. You have to resist everything you've ever been taught about upsetting people and accept that what you are saying may be upsetting, but it's better for you to get it out because of the negative effect on you. The other person is responsible for their own reaction, and you are responsible for yours.
SET is a very good method for saying hard truths. Will you read through this workshop and then return here and practice how you could say something that you have been putting off saying?