No Respect
This one just seems a little mean. I would strike and let the person who wrote this lovely note clean up the messes that other people leave. Without that custodian that you are so quick to dismiss you would be surrounded by trash because for some reason it seems impossible for people to clean up after themselves.
You may not appreciate them but I do. Someone has to do it. I don’t see anyone volunteering to clean up the crap that everyone else leaves behind. Some of you are just nasty too. Is it really that hard to throw something away yourself? It would make everyone’s lives so much easier.