Manners or etiquette?

[cat]

On Sat morning I was at a huge market in Bangkok. It was busy but not very noisy. Just then i heard this voice" But I demand a discount" Well we can all guess as to what colour and country that came from. I stood in disbelief as this huge fat (insert many 4 letter words) screamed and demanded that this poor Thai lady give her more discount. This market is well known for it cheap clothes. You can get Amarni, Diesel , Same etc and next to nothing. Many shops have signs that say fixed prices. The whole market came to a stand still to watch this little thing going on. Next minute the tourist police came over and asked this lady and her friend to leave.

I was shocked at such behaviour.
On Sunday morning as true as bob, I am eating quietly in the restaurant everybody is realxed and quiet next minute old fatty boom boom screams at her friend at the other side of the room to tell her that they have more bacon and does she want some. The friend screams back and then she takes a plate and fills it with bacon. I think she almost finished it. Her friend went back later and we all heard if she wanted more coffee.

How can people behave like that in public? I was so embarassed for them. Not even the Americans are that loud or rude. (No offence to the Amercicans here)
Well South African , and a non- white
Yes, I see you know about that market.