Haha this is funny! I have a preference for "vapor" myself, and just dont like "vapour" for some reason.
But- the A.I. speech to talk function on my tablet, which I use alongside typing to save hand/wrist issues, only seems to know "VAPOUR"!
So get this- I actually painstakingly edit it out and correct it every single time would you believe hahaha, talk about anal!
I wish I could teach the damn thing how VAPOR is actually spelt.
Edit- reading above, I see that it is us stupid Brits that came up with this dumb "vapour" shit! Can you tell I'm not very patriotic?