It's Junior High, and it's just about what everyone has experienced at one time or another. This is how Junior High and children (yes, children) of that age group work. They seek out anyone different and they pick on them. It's not pleasant or fun but it resolves itself as everyone gets older.
Now, about the term persecution -- might wanna revisit that term and remember what it really means. People who've been persecuted for their beliefs, that's not you, sorry. You're being way over the top dramatic about this, but that's another behavior I fully expect from people in Junior High (and if you call it Middle School it's all the same, I am talking about 6th to 9th graders, and you fall smack dab in the middle of all that).
But who are some people who were really persecuted for their beliefs, or perhaps even died for them?
Here's a whole raft of persecutions.
Those too remote and impersonal for you? Then how about some recent historical figures persecuted/killed for what they believed in or for doing what they believed was right? How 'bout these folks?
You may not agree with this list or what some or most of these people were doing but the bottom line is they paid the ultimate price for what they did in life. You were called a name by a classmate. Your remedy is to go to your teacher or the principal and complain. Your issues aren't even on the same planet as these folks.