An interesting take which unfortunately people contrive down to one oversimplified answer: Antisemitism. Perhaps this stems from collective guilt in Europe in regards to the Holocaust
There is a reason thousands of Jews worldwide are also calling for a permanent ceasefire and an end to the brutal occupation of Gaza and it’s not because they’re “self-hating Jews”; they recognise along with everyone else that “Never Again” means never again for anybody.
The fact that the once unpopular Yemeni Houthis have been taking decisive, non violent actions (in the sense of zero loss of life) to effectively sanction Israel whilst the US and UK have failed to hold Israel accountable for their war crimes and acts of genocide has shown the world that Western claims of moral superiority are deeply unfounded. With social media, the younger generation are noticing clear media bias which is swinging support towards the Palestinian cause, and, in turn, the Yemeni Houthis