I don't think it is worth arguing whether some GI's are stupid or not. There are some great GI's around and there are some who are the worst medical "experts" I have ever come across. So, all of us as UC patients can make our own judgements. It's a free country.
If people want to nominate an outstanding GI for a coveted award, then thats great. Conversely, if people want to label a particular GI as stupid, then that is equally fine.
Back to the topic in hand - I was told by a GI that left-sided UC does not respond as well to medications as pan-colitis. He cited Imuran as a particular example.
This can sound hard to believe as pan-UC is much more serious than left-sided, but I think when UC does respond to meds, pan-UC is more likely to than left-sided. This is the case for me. My pan-UC flare which was my first flare went into remission with azathioprine.
I have had numerous flares since - all left-sided - and none responded to azathioprine.