It isn't easy being green... or is it?

Red and yellow and pink and green - purple and orange and blue.
Day by day, we depend on these colours. Some will dye their hair green while others will scrub their skin orange... The one odd person who chooses to do both will look like a close descendant of these fair folk:




But. My question for you today. Or theory, if you will.
We may all be colourblind...
AND NOT EVEN KNOW IT.
Dun
DUN
DUUUUUUUUUUUUHHHHHHNNNN!!!

...

Well.. Not colourblind so to speak, but something else...

How do we know that the colours we are really seeing are matched in the eyes of others?
As in, how on earth do I know that you see the same colour for what we call green? We both call it green, sure, but how do you know that your green is in fact, red? Do we all perceive colours differently? What I see as green could really be red to you but we both call it green and never know the difference. Because you've grown up knowing that that's the colour is called 'green'.

In a more simplistic and easier way of saying this, I'm going to write a hypothetical.
So one day you wake up in your bed and it's pretty awesome. You open your eyes and see all the colours around you. You see the suns rays dance off the green of the granny smith apple. You admire the redness of your elmo doll besides you. You look at your Green day and Red Hot Chilli’s poster and smile contented. You are feeling merry like the colours of christmas. Before you can press those two merry feet on the floor, a fairy suddenly appears in front of you. You're a bit 'wtf' but go with the flow because you're cool like that. The fairy offers you an opportunity to see the world in your sisters eyes. You're pretty freaked out that a fairy is talking to you at the moment and figure ‘look, you’re never going to get an opportunity like this again’ so you agree. The fairy does the spell and you are seeing from your sisters eyes. All of a sudden things change. The green Granny Smith apple appears to be red and Elmo looks like he digested something that didn’t agree with him. You look outside your window and the phrase 'to paint the town red' is beheld right in front of your very eyes.

Holly shit! What are you tripping on?" you exclaim, waking up your sister whilst throwing your arms like Olive Oil in Popeye, "You can't see green right!"
"What are you talking about, that IS green!"
"No it's not! It's red! Look!"
"Dude, I'm pretty sure I know what green looks like.” She picks up your granny smith apple. “THIS is green.”
“That IS meant to be green, but you’re seeing it as red!”

Your sister is unconvinced. You pick up your rose.
“This rose is meant to be red.”
“That IS red.”
“I know, but you’re seeing it as green and have been calling it red this whole time without even realizing!”

You look in the mirror. You have green lips and red eyes. You look like a evil version of the green telletubby. But your sister keeps insisting - "no, that's the colour RED you dingus!"
"No, that's green! But I'm seeing red! YOU HAVE CRAP EYES!!"
"Dude!" she goes downstairs and grabs tomato sause. "This is the colour red"
"I know that! BUT I'M SEEING GREEN! YOU'RE JUST CALLING IT RED!!!!"
"That colour you're seeing right now - it's red mate!"
"IT”S MEANT TO BE RED! BUT YOU SEE GREEN!”

Suddenly, your world changes. Rudolf has no red nose, green day turns into red day and TOMATO SAUSE NEVER TASTES THE SAME AGAIN BECAUSE YOU’RE EATING GREEN!

So I ask you this my friends:
How do you know that the sky is really purple, our skin is really blue and WE’RE ALL LIVING OOMPA LOOMPAS!??!

I tried SO HARD to explain this to my Mum and sister but to no avail. They just stared at me like this for a while:



...and said ‘no.’
Then I explained again.
There was a pause as they looked at me with cocked eyebrows.
‘No.’ they said.
And then I wailed ‘NO ONE UNDERSTANDS ME!!!!’ and a Victoria-shaped hole was through the wall...
...Not really but still...

Please tell me you understand what I’m talking about, because, in the words of comic book guy: “THERE IS NO EMOTICON TO WHAT I’M FEELING RIGHT NOW!!!!’

So, I ask you my friends, was Kermit the frog right when he said it wasn't easy being green? Does that song "I see Red, I see Red, I see Red" REALLY see red? WILL LITTLE RED RIDING HOOD BE AFFECTED IN ANY WAY BECAUSE OF THIS!?!?! 

...You be the judge.