<human>: An example is from last weekend. My dad passed away when I was 16 and one of the last things he gave me was a beautiful acoustic guitar. On my college campus there was a huge music festival and everyone was hammered and rowdy. I came home to my apartment being a complete mess with two creepy people I never met before hooking up on my couch. I assumed one of my roommates knew them and shrugged it off. 

As I passed by and entered my room I heard a crash and some gasps. I walked back into the living room to find that they had knocked over my guitar, and spilled a bowl of hot and spiced ramen all over it (and into it). I came around the corner as the guy was shaking my acoustic over a balcony to dump the fluid out it. I immediately was... disappointed, took it from him, and just kept saying to them "It's okay, yeah I know you're sorry," but that was it. I quietly returned to my room and took off the strings, wiping it down. 

The guitar is cracked and wreaks of cheap food. Later, my other roommate found that they had stayed on the balcony to have sex (these people were ugly as hell by the way), before finally getting yelled at by another roommate who realized they knew no one at our apartment and they ran off.

The thing is, I found myself disgusted, but not enraged. A younger me would have beaten the hell out of the guy. So what is this? Is this maturity? Did I under-react? I felt strange for not being more passionate about this.

Summarize the given text in a few sentences.
<bot>: Ugly people who basically intruded on our property completely ruined one of the last gifts my dad gave me before he passed away while I reacted very calm (in my mind too calm). Asking reddit to see if this is normal.