I’ve had people laugh. Others just stare. One or two people murmured some kind of critical response that I couldn’t hear. I find it strange and just wanted to know if this is an ordinary experience. It’s rare for someone to agree. I live in a rich white area.
They all shout the same thing again in unison because the only time I ever say that irl is at actions or with an audience of lefties.
I do still advocate for Palestine with other phrases, I just never say the phrase "free Palestine" in part of normal conversation.
I do use "from the river to the sea" though and that one is polarizing in the best of ways.