Maryhill also played in the first Junior Cup, so is that a different team than the Maryhill of today (genuinely no idea, so not trying to be snide!)?
http://sfha.org.uk/scottishjuniorcup18861900.pdf
To paraphrase your good self:
"It’s describing the colour of a white person’s skin, when jealous, in a negative way. Put simply - it’s a racial slur."
Your next account really needs to work on the consistency of your argument.
Where can I join your campaign to get 'green with envy' taken out of conversation? An equally unacceptable negative slur about the skin colour, and indeed mental state, of those of a particular race, I'm sure you'll agree.