Is he also loud with the toilet seat when not mad about it being in disrepair? Why isn't he trying to help you figure out what's going on with the handle/flush mechanism? Toilets are only good for 50years, how long has that toilet been there? Is there a pipe leak somewhere in the building? Do some screws need to be tightened? Is this a your problem or is there a landlord that's is responsible for it?
How's the water pressure, otherwise?