Wechat is popular among us，but if someone deletes you or blocks（屏蔽）you on it，does it mean you've made him or her angry？
It depends．
Maybe you have just left messages too often without much valuable information．For example，the questions are those like‘how are u？'‘what are u doing？'‘do u love me？'too often．You know，people may feel bored after answering such kinds of questions time after time．
Another possible reason may be that you've sent something unpleasant to your friend or in your friend circle．I just blocked one of my middle school classmates yesterday because she was trying to sell fake goods in the friend circle，and I hate it quite much．
Some people delete the one's name from friends'list because they no longer want to see it （maybe ex﹣boyfriend or ex﹣girlfriend）and they don't want the one to see their"Moments"（动态） on WeChat （maybe they publish very private pictures or life or thoughts they don't want to share with him or her．）
So why you are blocked may depend on his or her mood or preference （喜好），and the reasons a person gets blocked are various from person to person．So I suggest you to write an email or make a phone call to that person if he or she really means a lot to you to see why he or she is dissatisfied with you，and to find out how you can make up for the case．
