Okay I'm sure the whole headlice thing has been done to death on here as on probably all parenting forums, so I will try not to "go there" too much.
DD is at a Summer School this week, realised last night she had picked up the dreaded mini beasties, & considering she was checked thoroughly on Sunday with her weekly hair wash & was clear, & we've been lucky in that she's only ever had them 3 times, & previously most found were 2......so I was a bit gobsmacked to find 6 adults, & tons of eggs.........whole family suitably treat, deloused, & repelant etc etc....so lots of hard work & over £30 odd lighter & neck ache later
I did the responsible thing & let the Summer School leader know straight away, wasn't accusing, I'm well aware its all part of the joys of having kids she was grateful, especially as her own Kids are also in the class. & also did the responsible thing & let the other parents know
on over hearing her tell 1 Mum, the response was..."oh don't worry about that, mine have them continuously, they are super bugs these days, can't get rid of them, no point in worrying about them
IMO bad enough having that attitude, but FFS, at least be embarrassed to own up to it