Players are more likely to get reported for being bad than for actual offenses.
I suggest removing the report button, since it seems to be used mostly by aggressive and unsportmanlike players that can't handle loosing.
Screaming "kill yourself feeder, ill report you" at teammates seems to be pretty common behavior. Same goes for trying to make the whole team surrender just because u personally consider any loosing game "wasted time" and threatening everybody else with a "report". People that can only have fun when constantly, flawlessly winning and otherwise start massive insults should just play alone. Yet they seem to be enjoying the report button most.
The idea alone that u could report somebody for being new, or simply for not being good is downright (let's face it, i'm sorry) stupid. Yet it seems to be the main reason players call for "reports".
Obviously you can't expect random people you don't even know to match your personal standards. Real, massive harassment like: "Kill yourself feeder" on the other hand seems to be fine with a lot of players. If u think now: "That's just trashtalking, it's all fine" ---> Even if u are 14 years all, you should know: There are limits. Something like "kill yourself" is actually a legally relevant offense.
Real offenses likely to be lost in the masses of "when-i-loose-i-want-to-hurt-somebody"-reports.
