I recently attempted to do LI HM through group finder just because I wanted to try to get the daily. Admittedly, I was unprepared. I don't think I was under-geared (rakata earpiece, implants, belt, bracers, matrix cube, and champion relic all aug'd...plus a full warhero set), but I had not studied the fight. I got booted twice. Once the others were nice about it. They didn't actually boot me, just asked that I leave and suggested I study up on youtube before trying again. The other time, not so much. I guess I can understand, but both times it was a group that obviously needed a healer and had requested that group finder fill the role. As the person before me said, at least one person made it on to my ignore list. You can't magically wish up a full rakata healer who has ran the flashpoint 10 times to escort you through. At some point you have to deal with people who want to learn. If you don't have time to hold hands, then just be upfront about it with the person.
That sounds reasonable.