Well, what to do, can’t help it. We are surrounded by a pool of oldies. Passed down from generations after generations with no access to science and research. All hearsay. Just be humble, you do you, they do them. Some old wives tales can just happen to be true, so you never know. It’s okay to heed their advices once a while but if you strongly feel that there’s a research stating against it, then brush it off politely.
I drank cold water too throughout both my pregnancies. I just don’t drink them after I gave birth cause I’m afraid of blood clotting as I had complications and an emergency c-sect. So didn’t wanna complicate my post-delivery any further as every body has different ways of healing and reactions to certain things.