Boundaries are important because letting someone do something unpleasant that you don’t want does not make them like you more. Having no boundaries does not mean that other people will let you do what you want to them in return. In fact it does the opposite: it shows them that they have power over you, and that you are likely to allow them to do what they want to you with an increasing frequency and unpleasantness. So create and hold a boundary, especially as people test it.
I definitely need to be better about "not wanting to rock the boat" and need to stand up for myself and my values.