I'm another who was bullied horrendously for the crime of having red hair as a child. I'm in Scotland so I'm always bemused when I see these threads proclaiming that there is no prejudice against red hair here. Maybe it has got better but I was certainly not the only child to suffer during my childhood.
As a child I was:
Thrown down staircases at school on as least two occasions (I still get panicky when someone walks behind me on a staircase)
Randomly punched in the face by a passing older pupil whom I'd never seen before in my life
Pushed into traffic while standing at a bus stop.
Told by a teacher, to the laughter of classmates, "I can't stand the sight of gingers. You make me sick"
Never, ever asked out by boys - it was made quite clear how my classmates viewed the idea of getting intimate with "a ginger".
Other types of bullying including nobody wanting to sit with me in case they caught "ginger disease" and then, as I got older, references to ginger pubes.
I kept diaries through my teenage years and reading these back now scares me to death; I wrote constantly about how lonely and miserable I was and how I wanted to kill myself but didn’t have the knowledge or means to do it (I shudder to think what I might have done if the internet had been around back then). The most heartbreaking thing was that despite is being the source of my unhappiness, I loved my hair colour - I thought it was vibrant and alive and couldn’t understand why it was a source of amusement or disgust for so many other people.
PP have mentioned how many people love and seek red hair but as a child this wasn't helpful. If I was stopped by a well meaning old lady in the village at lunchtime who wanted to touch my hair and tell me how she always wanted that shade, you could bet that the bullying that afternoon would be worse.
As an adult, I find discriminatory incidents few and far between but then I tend to be blindsided and revert back to being that unconfident, bullied child when they do happen. Once, waiting to go into a nightclub with friends, I was cornered by a group of idiots who told me I was going to get glassed once inside. They were very menacing and I was terrified so jumped in a taxi home to the bemusement of my friends who were convinced they were "all talk". Then, a few years ago, while walking home from work (as a 35 year old women in a business suit), I was followed by a group of teenagers calling me names, wanting to see my "ginger pubes" and telling me they were going to throw me into the river. Almost every pregnant woman I've ever worked with has made a joke about loving it "even if it's ginger".
It's horrible and it’s disgusting that this form of prejudice is still seen as acceptable and part of Britishness. I agree with PPs that overly focusing on beautiful red-headed celebrities can be seen as over-compensating and could do more harm than good. Let's not forget that Nicole Kidman once said in an interview that she wasn't a natural ginger while making ugh noises and claimed to dye her hair a nice share of red. Also I've heard friends kids claim that Brave is the worst Disney film because the princess is a ginger (although I've not heard the same about The Little Mermaid). don't know what the answer is though - maybe focusing on the bullies behaviour and why your girls should feel sorry for them?