No, FT - she's right!
Amused and I have 'crossed swords' on may occasions, (and will probably continue to do so), but credit where it's due, she empathised with my situation and offered a reasonable explanation. The 'internal planning error' would have been a more viable excuse than actually telling me that I turned up for class looking drunk. There WAS no 'internal planning error' and she never said there was!
She only submitted that an 'internal planning error' would have been a more viable excuse.

Teaching English swear words or teaching sex education is just asking for trouble. You chose your LAST lesson to teach swear words. Your original post said your 'red-eye' was the FIRST reason they gave you for declining to invite you to teach again. You never mentioned teaching swear words in that initial post. You didn't tell us the whole story in that post. I smelt a rat, unlike 'amused'.

'Amused' shouldn't be surprised that the sex education class caused her trouble re her future employment there.

I think both of you got your just desserts for sticking your necks out. No sympathy or empathy from me!