Photography

I've recently grown really fond of street photography and I follow similar moral rules as you mentioned: avoid kids and people who may be disabled. I actually love people in compromising positions or unflattering shots, but I don't often post them on Instagram or Flickr unless the composition and general scene is worth it.

I'm just echoing what the majority of people have commented already, but you should take photos and post what you feel comfortable with. That's another aspect of "you" that informs your unique style. If you'd rather avoid having people's faces visible, try snapping those shots. But if you like the weird and wonderful abstract tapestry that is the public at large then you shouldn't listen to your friend's opinion and instead lean into what you enjoy. Unless you are being creepy, which it doesn't seem like you are, your friend is projecting their own insecurities onto you.

Remember, living your life based on others' opinions won't bring happiness or personal growth.

At the end of the day, you're in public and so are your subjects. So long as you remain respectful and nonconfrontational, you're golden. And posting those shots, imo, is completely correct and proper and does not make you a horrible person.