I think you're friend was getting confused, colour temperature is different to ambient temperature. Blue is classed as 'cool' and red is 'warm'.
Different light sources have a different 'colour temperature', eg LED lights, fluorescent tubes and energy saving bulbs often tend to be 'cool', incandescent lights tend to be 'warm'.
Purely by coincidence it often corresponds with the physical temperature (ie: incandescent bulbs are too hot to touch whereas fluorescent tubes and LEDs can often be touched while they're on (don't try that though!)).
The white balance function in a camera or editing software is designed to correct this, I think by using known 'colour temperatures' on the Kelvin scale.
Try searching Google Images for 'colour temperature scale' and you will get some good ideas about where different light sources fall on it