My stomping grounds is Washington DC, not everyone in that city wants to be "chatted" up by a photographer who just took their picture!! LOL.
25+ years in DC and I never chatted up anyone. But the subjects often have questions when you shoot them and since I have no reason to hide what I'm doing (and I still get candids btw), I answer them. If I'm going to use their image, I feel that's the least I can do.
That said, it is up to you what you do but if you do enough street shooting, you will soon find out why interesting street shooters use normal to, even more often, slight wide angle lenses. Besides the 3 I mentioned earlier, there is a technical reason why long lenses don't work very well.