So what if you were on the internet and you asked for someone to be your friend and he/she kepts being mean?

Like I asked him/her to my friend and they just started asking me questions. They tried to call me a stalker then they tried to predict my age and then what grade I was in and then on top of that they tried to get mean and smart and I told them I wasn't having it and they asked me what I was going to do and then I am nice and I don't want to be mean and cruel because that is wrong but I am scared! They won't leave me alone and then try to blame. They told me they were over 100 and then trie dtotell me I had no right for asking when he asked me first! Then he they said that I am just crazy! I don't know what to do I told them to leave me alone but I don't know how they are taking it! I don't know what is their problem but tey don't like me and they like predicting things that are not true and then.. they are going to say that they think I am a stalker when they have been trying to find out my age, and what grade I am in and he said that I don't need to know if he/she is in a grade! Help