The next cart we went to was ready for us Rodger went up to two sisters and they held up his their hands as he approached the cart.
Even if you were wearing t-shirts that said: "I'm a JW Apostate!", their refusing to speak to you by putting up their hands is downright childish. It's not likely you're seeking them out in the privacy of their own homes; they've actively put themselves out on the public streets for the sole purpose of engaging with members of the public.
I'm not encouraging harassment of them at all, but I could only imagine what their reaction would be if you continued to talk to them in a normal conversational manner for a few minutes. Their behavior would look mighty odd to everyone passing by.