Oh yes definitely. I normally try to be a kind and caring person, but even I have my limits when pushed too far over the edge. In fact, I remember this one time in the game Wizard101. Me and my friend were fighting a boss and then this random person joins and later removes the traps that my friend set despite him asking the person not to. He lost it and started harassing them over it, to which I reported him for his behavior. A couple of days later he asked me if I was the one who reported him that day to which I said yes. To my surprise he actually thanked me for doing so as apparently he received a temporary mute punishment for his behavior, which was a big wake-up call for him as he didn't want to lose his account. He also apologized for his behavior that day as well.
Another example is also from W101. A couple of years ago a random player asked me to help him out with some quests, to which I did (he'd always call me "master" like master and apprentice-his idea not mine). Only later on did I discover his true personality of sorts where he would constantly verbally abuse and harass my other friends and also constantly bombard me for help requests for fights that he hadn't even attempted on his own yet*. Eventually it got to the point where I had had enough, confronted him about it and deleted him from my list (ironically in the same place in-game where we first met), to which is final response was something along the lines of "you barely helped out anyways, lol".
TL;DR Yes, even if you're on my friends list I will report you if you decide to act up. I can let minor hiccups here and there slide but if it's at the point where you're just being a jerk to me and/or others then I will report you and/or delete you from my list. This is also partially why I don't like adding random people that I don't know, as I like to try to get to know someone first and see if they are truly worthy/deserving of being on my friends list.
*As a rule of thumb I don't mind helping people with tricky fights but I'd prefer if they'd try it on their own at least once first before asking me for help. I'll help you with it but I won't do it for you.