I think since it is something we all do to a greater or lesser extent her colleagues should grow up and leave their schoolyard humour where it belongs. In their long-passed youth.
Bodily functions are not anything to be sniggered at, that is so pathetic!
And since it is such an awful illness to have, the last thing that poor woman needs is to have them making hurtful remarks.
It's just childish and unnecessary.
And they are right they shouldn't have to put up with it...They should feel free to quit and find themselves another job anytime they feel like they cannot stay there any longer!!!