I've worn mine to protests and Palestinian people like go out of their way to interact with me, waving, saying hello, etc.,

I bought mine probably in June and wore it to a socialist convention in August in solidarity with a pro-BDS group that was the center of a big struggle session in the org. Honestly at the time it seemed a little weird (I was joking "solidarity with BDS and yt pepo in Keffiyehs") but that was like 15000 deaths ago. When the enemies are out in the open its easier to tell who is on your side.

Also "cultural appropriation" is a form of erasure. Since you wear it to try and save the culture of the Palestinians, to protect it and defend it, you aren't appropriating. Like, technically. Appropriation is taking the cultural capital of another culture that can be monetized and commodifying it, while erasing other forms of social and cultural capital that can't be made into commodities. This severs the cultural symbol from its original (now eliminated) cultural and social context, leaving only the commodity. At least that's my formulation