While it's courtious to be respectful of another's feelings, unfortunately you don't need to pass a sympathy test to enter the medical field. More times than not, not just doctors or nurses, people won't understand "what the big deal is." It's very very common for someone to simply not understand the plight of another person because they have yet to be affected by it.
It's really annoying and I think it's happened to all of us, in some form or another. Don't let situations like this get you down. Hang in there.