I"ve made it a habit not to discuss BC with acquaintances. It"s been 21 yrs trying to stay healthy happy and cancer free, I don't allow non medical people give me advice about BC.
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Usually, I just listen, then say, that's interesting- do you recall which of the 20+ bc diagnoses the research showed it was effective for? Usually people don't realize (I know I didn't) that bc is not a "one size fits all", and that I am only interested in research based information.

Since it's usually my husband, I hear him out. He studied to become a nutritionist and has some good advice. Another person I listen to is his best friend, who worked as a surgical assistant for many years.
I guess what I'm saying is that it depends on the person. If you know they have medical training, here them out. Strangers get "Oh, I didn't you were in the medical field". If they admit they aren't, politely tell them that you prefer to get your advice from someone that is.

For me it all depends on who it is, what exactly they are saying, and what kind of mood I'm in. I've gotten really good at politely cutting people off and changing the subject. Most people mean well, but are ignorant. Earlier on it used to be hard and occasionally upsetting, but after 9 years of dealing with it I've come up with a variety of responses. A lot of the time I'm likely to laugh at the non cancer patient trying to give me advice and then tell them as a 6 time cancer patient I'm a frequent flyer and it's not my 1st rodeo, so thanks, but I'm good.

Good question... I just thank them for the unsolicited advice and go with what my doctor tells me. I mean, she's the best and knows her stuff. Cancer is a shit show anyway, so why chance it?