I asked irl people what their favourite colour of X and Y was and these are the answers:

•Yellow x5

•Black x5

•Black or purple

•Sky

•Yes

•I'm an NPC

•Purple x2

•I don't know what that is.

•No x2

•Y these nuts

•I don't care

•Orange x2

•I don't know, why you asking me?

•I don't know x2

•That one

•Blue x2

•I don't know what you on about

•Red

•Green

•Jump

•Yellow x5

•Black x5

•Black or purple

•Sky

•Yes

•I'm an NPC

•Purple x2

•I don't know what that is.

•No x2

•Y these nuts

•I don't care

•Orange x2

•I don't know, why you asking me?

•I don't know x2

•That one

•Blue x2

•I don't know what you on about

•Red

•Green

•Jump

Inspired by @reid