If Catholics feel free to contend for their faith, they have to expect that others are going to feel the same about THEIR faith.
If you see someone following what you perceive as error that is going to lead them to harm spiritually, do warn them or not?
Which is more loving? To warn them or to let them follow their own path to their detriment?
If I saw a truck bearing down on you about to make roadkill of you, would I be more loving to grab you and pull you out of the way or tell you to get out of the way, or to not warn you because you might be *offended* by me telling or making you to do something you don’t want to do?
What I am trying to say is that, is that, instead of arguing on the “small details”, find what can help bring Christians from all the different churches together.