Because the Houthis don’t give a shit about Palestine, they’re trying to establish themselves as the de facto leaders of Yemen by getting media attention. They haven’t stopped any Israeli vessels, but instead, other nations’ vessels entirely unrelated to the conflict, they haven’t even affected Israel’s economy and instead are harming other nations in the area. The Houthis are also terrorists, their flag even states:

The Yemeni people are also facing starvation, persecution and genocide by the Houthis. They’re indefensible.