Just some random thoughts at the top of my head as of this moment:
Treat people the way you'd like to be treated. No matter who they are, where they're from, what their circumstances are, just treat everyone nicely. When I officially started working and met some awful people who treated me like crap, it hit me really hard as I've always thought the possibility of meeting people like them would be zero, simply because I didn't think having people treat you in that way was possible. Like, how can people be such jerks? I just couldn't fully comprehend that these people could treat others the way that they did.
I've come to the realisation that you will meet these type of people everywhere you go and that's why it's important to treat others with the same respect you would like for yourself. However I'm glad I've met these dislikable people along the way. I know how to not treat a person, but they really showed me how to not treat a person. For that, I'm very thankful. I'm often told by friends that I'm too nice to others. I don't believe there's such thing as being 'too nice'. Sure, there will be those who will take advantage of your kindness, but I'd rather be kind than to be a biatch. And if it's worth the effort, I will be vocal and stand up for myself if I ever do feel threatened. I just know what it feels like to be treated like crap and don't want anybody else going through what I had to go through. We are all good enough, no matter how judgemental they are of you. You are good enough. Nobody has the right to hurt you because only you know what your limits and capabilities are.
