That's the experience for some neurodivergent or somehow naïve women the first time. I was one of them (I thought older men were being kind with my teenage self). Then you start getting the same comment again and again: it often feels insincere. You start suspecting and learning about all the ways [mostly] men can be manipulating or even dangerous in the streets. It starts becoming bittersweet; you learn to ignore it just in case it's the people with bad intentions. You know that, if someone really wants to tell you that you're pretty or something, they will make an effort to make you feel safer too. And then, you are in your twenties and those men don't talk to you nearly as often, and it's a relief. As a heterosexual/bisexual woman, you hope that the rest of men can see you as more than a pretty body: a human with dreams, hobbies sense of humor, intelligence, whatever. Sometimes it's scary to know that many men don't, but many others do, so... yeah, my leftism hopes it gets better, as with many other social issues.

That's my experience.