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Please think before you comment on people's physical traits/appearance! There is NO NEED WHATSOEVER to shame, belittle or otherwise mess with someone's feelings because of something as superficial and unimportant than looks!! It's dumb, it's insensitive, it's unnecessary, uncalled for and oftentimes simply cruel.
Care for some examples?
I was walking my dogs once and stopped at a local dogpark where an elder woman started chatting to me. She was nice enough, but all of a sudden she asked why I didn't get my teeth fix. Yeah, I am 100% aware that I have crooked front teeth. I don't really care, I accept them the way they are, back then I also was not generally in a good mental state and such a comment felt downright mean and utterly out of place. Luckily, I was able to tell her as much by coolly stating that this was none of her business and that it's extremely impolite and rude to say something like that...
I've also had several occassions in my life where people told me negative things about my hair which is not only rude, but also plain racist. European, white people telling me, a PoC, that I should get another hairstyle 'cuz it would look "much better"?! I mean, do they even know what they are suggesting?! Yeah, get over it; not everybody needs to have fair, straight hair. I like my hair the way it is naturally: curly, sometimes a little messy, and whenever I dye it, I do it because I enjoy being colorful (I had it pink for quite some time), but that's my decision and no one else's business and maybe these people should take a long hard look at themselves and understand how utterly brainwashed they have been to believe that there is exactly ONE way of being beautiful/handsome/pretty.
Also, do not comment on people's weight!! Seriously?! Why is this even still a thing?! You know NOTHING about a person's history, about their eating habits, their routines, you don't know whether they are struggling with an eating disorder and you certainly don't get to decide what their body has to look like for them to like and celebrate themselves!! It's just not okay to tell someone "Oh, you used to be so thin, what happened?" or "You have lost way too much weight, it doesn't suit you at all!" or "You've grown fat since I last saw you" - CUT THAT SH*T!!
Also, you don't have to comment on other people's fashion preferences; if you don't want to wear skinny jeans or leoprints or bright neon colors or cheap shoes or wheaver, well, you are not obliged to do so, but let other people wear whatever they want and just LEAVE THEM ALONE.