Help. I've been on Planet Mars for several weeks, so what's all this talk about butter?
It's what's known as a "Brexiter Deflection."
When an argument is going badly, and the British position is being shown up for the ridiculous catalogue of mismanagement, bad faith negotiation and ineffectual attempts at "looking strong", then Brexiters do the equivalent of throwing a dead cat on the table so that everybody's attention is suddenly focused on the dead cat rather than the real issues.
Britain negotiated a rotten deal, but they told everybody it was a great deal, signed it, ratified it and now that the stupidity of what they did has shown them up for the bungling amateurs that they are, they attempt to weasel out of it.
Apologists for their ineptitude then come up with fatuous arguments such as spreading butter on sandwiches as some sort of defence of the British government's position.
Honestly......... I'm not making this up.
Oh....... and the apologists try to tell us that the British are being really reasonable, but when challenged to come up with examples of this reasoning, go strangely quiet.