Eh, it really depends on context for a question like this.
My friends aren't perfect. Im not perfect. So whenever something arises that may seem a little off we are completely able to have a transparent conversation and give constructive feedback. As long as you know feedback is coming from a place of love and care then its all good.
If ever I have concerns about something they're doing I bring the pro's and cons to their attention, how it affects us, while accepting that it's there right to choose, and we move on.
Luckily my friends and I have this and Im thankful for it. They inspire me and help me to be better in all facets. That's what I think friends should do.