I think it just means you should treat others the way that you yourself would want to be treated- not with specific things, just in general. Like if you wouldn’t want to be talked about behind your back then don’t talk about others behind your back or if you would want someone to cheer you up when you’re in a bad mood then when you see someone else in a bad mood, cheer them up instead of ignoring them. I don’t think it means that if you like licorice then you should by your friend licorice even though he HATES licorice just cause you want it.
it’s just saying a general rule of treating others with kindness and respect the same way that you want kindness and respect.