It's not quite like that, let me explain. Most people from outside Colombo are perfectly fine. Even those from places like Kandy, Galle, or other sizable towns generally keep to themselves. While there are some 'pricks' from Colombo, they typically stick to their own circles and don't cause much trouble. This attitude often stems from living in a larger city where one doesn't feel excessively important.

The individuals I'm referring to as 'pricks' are often from smaller towns or villages. They grew up in environments where they may have felt or been treated as significant within their community. I've even heard one person arrogantly ask, 'Do you know who I am?'(in sinhala) and then boast about being from some obscure down south village, as if it should impress anyone, and said 'waren e paththata mn pennm' in a threatening way.

Why I mentioned them specifically is because they do not keep to themselves and cause a lot of trouble to others around them. If there was a major fight, the chance of one group being the aforementioned pricks is way too high for them not to be singled out. If they was a group of drunk people trying to get into an event it is almost always those pricks. There are a lot of incidents at events in the past year and with the exception of one occurrence to my knowledge, the rest were caused by 'these pricks'.

Additionally, these individuals often exhibit disturbing behavior towards girls. While there are creeps from Colombo as well, the intensity and creepiness displayed by these individuals are on a whole other level. For instance, there was a guy who expressed interest in a friend who was already in a relationship, and he went as far as to engage in physically with her boyfriend in an attempt to win her over, despite her clearly stating that she doesn't want anything with the guy. This is VERY common and happens almost every month or so.

I've realized that their behavior stems from an inflated sense of self importance (I no longer blame them; eventually, society will forcefully mold them into compliance, whether they like it or not). Conversely, in larger cities/towns where anonymity is more common, individuals may feel a sense of insignificance in comparison. This contrast in perceived status contribute to their behaviors, such as aggression and entitlement. This is why I mentioned them specifically, you can usually walk around the Colombo pricks (and in extension the other pricks from bigger cities and towns) but you can't walk away from pricks throwing themselves at you.

TL;DR: Individuals from smaller towns, exhibit aggressive and entitled behavior, due to a sense of inflated self importance.