My most hated sounds at a concert

After attending several students' graduation recitals, I realise that I am much pricklier and tetchier than I think I am. I just don't understand why some members in the audience are so obsessed about making extra sounds at a concert where keeping silent during the performance is good etiquette.

Below are what drove me crazy at the concerts.

• Crumpling plastic bags (I don't think anyone in the auditorium who rubs a plastic bag means to make a good contrapuntal part for the programme on stage. Even though this is the case, I don't think the performer or the audience would appreciate it.)
  
  
• Opening and closing handbags with velcro or hook-fastener straps repeatedly (Can you have whatever you need from your handbags before the programme starts?)
  
  
• Humming tunes (Well, it is crystal clear that you are an expert and have essential knowledge of the programme despite its esotericism, but you don't have to recite the tune. The audience are able to hear it from the stage.)
  
  
• Coughing incessantly (No offence, but I suppose anyone who is suffering from virus infection in which the mucous membrane of the nose and throat becomes inflamed when kindly refrain from attending a concert should sneezing, coughing or other similar symptoms appear.)
  
  
• Shutter clicking (I've noticed it's a posh ritzy digital single-lens reflex camera, and therefore you don't have to draw our attention by making those cursed sounds over and over.)
  
  
• Snoring (I don't care at all whether the programme is so tedious or droning that you can do nothing but snatch forty winks, but don't make those irritating snorting sounds.)

I propose, if producing uninvited sounds while watching the performance is very much desired, then go to an Ibiza rave party instead of coming to a Western classical concert.