I just ignore them and you should too. Otherwise if you think you will be reporting every one of them, well then go for it.
I think its not worth it to get them 3 days ban, cause I know they will create another hundred cracked accounts for free and keep disrespecting. And if you think IP ban will work then you are completely wrong they simply do "something" (I am not going to spoil the method for abusers) to negate IP bans.
So I usually report some high value victims like some kids with ranks or playtime or someone with more than one offences in past so they get extended punishment.
But I only does this to racist and disrespectful kids. If someone hacks or something like that I always report no matter what.