Everyone knows some one with/who has had cancer. Not everyone has loved, been raised by, took care of, cleaned up, carried, and watched die some one with cancer. So, hating to repeat myself, for the last time:
In fact, don't talk to anyone. You brought up something lightly, and in an accusatory manner, something that is serious to allot of people. I can take and make cancer joke all day, but you tried to make me feel guilty for being insensitive about it, and you stretched a long way to do it.