Have i done wrong...?

Feeling guilty today...

My company's lunch hour is between 12-2 & everyone is free to choose one hour in between to go for lunch...

But my team leader prefers some of the team members go for lunch at 12 & some go at 1 as he doesn't want our "island" to be really empty during lunch time...

So,i have always opted to go for lunch at 1 which is my preferred time though almost everyone in the company goes for lunch at 12...

So,as usual during lunch break at 12 today,almost everyone went for lunch while i continued to do my work until 1...

When i was cracking my break tryna figure out some complicated issues,some of the employees who just finished their lunch started to gather around a place near my seat & chit chat...

That was ok but next some of them actually watching some videos with the speaker on at a relatively high volume...

That has really annoyed me & i couldn't help myself but expressing my feelings at that moment by changing the status of my chat with the use of some really strong words...

I didn't think much as i assumed that they wouldn't be able to view it...

But  i was surprised when my team leader asked me what had happened...as he might not have seen me doing that...

And next my team members started to ask if i was ok...& finally i told one of them what really happened...

As a result, the employees was told not to do the same again...

But for some reason...i feel really guilty because of that...

Yes...they were not supposed to do that but what would happen if they eventually found out that i was the whistle blower?

Yes...i have been trying my best not to offend anyone in the company but would it be the same after today?

Was i being too emotional & impulsive?

Should i have covered it down instead?

I dunno...

I really dunno...

Have i done the right thing?