It has been my experience that MANY people on this site (not saying you, Cadet) pay lip service to "setting boundaries." I have found that that once you start actually pointing out where people need to do so, you often get a lot of flak from the MLC crowd.
To paraphrase that great marital sage, Jerry Seinfeld: I'm pretty sure that the ENFORCING of the boundary, is the most important part OF the boundary."