Watch out for the black ones, especially if they are called Teal,
IMHO its a load of danglies, red ones yellow or whatever the colour becomes the in thing and bad breeders will breed anything to make money that's why the reds were known for rage breeding from dogs that were genetically flawed because there was money to be made.
That makes a lot of sense.
1. A specific colour becomes popular
2. Breeders ignore temperament and prioritise that colour
3. Poor temperament gets bred into that colour
4. There are more dogs of that colour and the poor temperament gets noticed
5. People erroneously think it is the genetic components of the colour causing the poor temperament.
The upshot IS that more dogs of that colour have poor temperaments. But it is not the colour per se that has caused it.