I dont understand the extra se

I found this sentence "no importa en que se critica" i asume the person that does the criticizing is the people (la gente) but i dont understand what the extra se is for, it happens to me alot when i dont know for what purpose theres an extra se, can you direct me to some help with that as well?

submitted by /u/justoneperson85
[link] [comments]