Why are some people on here so rude and sarcastic?

I have gotten some very rude and sarcastic replies on some of my posts. Similar worlds is supposed to be a place to get support and understanding not meanness. What is wrong with people? They must love ripping vulnerable people . I already have poor self esteem and mental health issues and a very sensitive temperament /personality. For example, when I said I was looking for a husband that I do feel affection for and can grow to love to help me financially and emotionally, people made fun of me.