I'm Jewish, and very well aware of the existential threat that Israel has faced and does face. I know how antisemitism has ebbed and flowed in the Middle East, Europe, and beyond and has posed and now maybe even more poses a serious threat to Jews.
From a UK perspective, yes - arguably, this is the worst time in a long time to be Jewish IN the UK, and that is regrettable. In many ways, the UK is now a typical European country in terms of antisemitism. But that does not erase its long history - especially in Scotland - of being a haven for Jews and a safe place and a place where religious freedom and faith-based equality was, if not a reality, at least an ideal.
I am also aware of the extremely perilous situation for anyone living in Gaza right now, and the many many years of suffering there and in the Palestinian Territories that led up to this.
I'm absolutely fine with someone wearing a kaffiyeh whilst performing their duties in a UK supermarket. If the kaffiyeh posed a health or safety risk I'd assume that a supervisor or manager would intervene, and perhaps a policy would be written to disallow it, but I don't see that it does.
And yes, I'd classify Hamas as a terrorist organisation. But I don't equate all Palestinians or all Palestinian sympathizers with Hamas. And I certainly don't equate a kaffiyeh with Hamas, or view it as anti-Israel - in fact, there are plenty of Palestinians who are Israeli citizens and still wear the kaffiyeh.
This poster knows it was a political choice and not a cultural one because the whole scenario is completely made up BS posted on MN to spark convo's like this. Agree, mostly. It's possible that this poster doesn't know/care about any Jews or Israelis or Palestinians and doesn't know/care about anyone personally affected by the conflict, and therefore honestly thinks it's normal and possibly constructive to post this. But it isn't likely that they have such a strong interest in the topic AND absolutely zero historical knowledge or emotional intelligence about it.