Which is great... for some situations. But, of course, not all.+Mitch Samuels
Quite a large number of people care, actually. More don't, probably. And there are some trolls and others who simply don't understand. When being yourself means that you are living in violation of some rule, law, or custom, then you are always living with the fear that those who have the power will notice, and create a problem for you - be it arrest, harassment, or cutting you off from your social circle.
You're in high school, it's easy to ignore a lot of this. You probably have friends who use or used drugs, have a porn collection, or somehow otherwise break the rules and/or law - not at all uncommon in high school. Perhaps they're gay, or Jewish, Muslim, etc. Probably they don't have an issue with it - they don't see it as wrong; perhaps you don't either. But still in many cases, they'll keep it to themselves because someone around them does, and there are real repercussions to having it discovered. Some people don't care, some do. Those that do have that constant fear of 'can't be found out' - they often aren't doing anything wrong by their standards
, but they are by whomever sets the rules.
What's the penalty for standing out in school? Ostracism of your peers, harassment in general, loss of friends, being beat up, possibly getting in trouble - with the school, parents, possibly even the law. As an adult, many of the people we encounter are more accepting of differences, but the risks are the same - worse, actually. So, you live your life and keep this to yourself, but you are aware that if anyone were to find out, it'd be a problem - even when you're doing nothing wrong.
If you think this isn't a real risk ... look at your posts. You found someone different, and instead of trying to understand, you're punishing that person for being different.
Telling someone 'I don't like your name, you can't hang out here' online isn't any better than telling someone 'I don't like the color of your skin, so you can't come here' in person.