Being polite is tough when faced with the idiots you happen to know

So, a few days ago, as i finished my shift, i met a friend of mine who recently broke her arm as she was coming out of hospital. the following discussion ensued:

Idiotic occurence No.1
Me: Hi Jane!
Jane: Oh, hello. I broke my arm

Yes, i suppose the huge cast was not an obvious enough sign...

Idiotic occurence No.2

Jane was carrying an excessively heavy bag with the broken arm. I needed to instruct her to place her bag in her other non-broken arm.

Jane: OH! so THAT'S why my hand has been getting so swollen!

Idiotic occurence No.3
Jane: So do you have any advice for me?

Yeah, dont fucking strain it with heavy bags!!

What i really said:

Me: try to rest it, when sitting place it on a pillow.
Jane: so i guess i should use the sling i was given, right?

Oh Lord.

Idiotic occurence no.4 (and by far the worst of the lot)

Me: Good-bye Jane and take care of yourself.
Jane: I sure will.

then i got an inkling...it was a piece of very obvious advice...but one thing you learn in nursing is TAKE NOTHING FOR GRANTED.

Me: Make sure you dont stick anything in the cast to scratch yourself with because you could do irrepairable damage! WARNING: THIS LINK IS NOT FOR THE FAINT OF HEART AS IT SHOWS ULCERATION OF THE WORST KIND, WITH GANGRENE AND EXPOSED BONE, WHICH IS WHAT CAN HAPPEN TO SELF-INFLICTED WOUNDS WHICH FESTER BENEATH PLASTER CASTS DUE TO SCRATCHING WITH KNITTING NEEDLES, PENCILS, RULERS ECT.

Jane turned red. "well, i only did it once! bye bye!"

holy shit. i think i could have banged my head against a wall! the thing is, she should have been instructed about these kinds of things and she most obviously was not...or else she simply ignored what was told to her...actually, that was most probably the case.

sigh.