Encounter bad customer service at Shinkei Japanese restaurant at Toa Payoh Outlet

Pre entering into the restaurant was welcoming with smiles on the waitress. After sitting down, a waiter came to us and ask if  this is our first time here. I told him "yes". He then explained to me on the quantity on eat dish served and it's portion.

The feeling at the beginning is satisfying but not awesome.

After ordering, food was served accordingly. But the way the waiters and waitress clear the empty dishes aren't pleasant. The standard of clearing was also not standardised.

Main situation: The menus, recommendation standees and credit card standee dropped onto the ground as they lost balance holding the menus upright. The supervisor came over and said a sentence:" The menus are to heavy for the standees to support!"
We just kept quiet. She then went to the ground and start picking up the standees and menus. Her face was total black and pissed off and started to place the standees back into place but with anger.

The above situation shows a lot through her body language and facial expression.

How it could be done better:
Welcoming- Warm smiles and welcoming gestures are very important, not only shown by the one bring customers to their sits but all the server. Even if you have a super bad day, when you are on the ground, you are expected to smile . That's the basic requirement in a customer service industry.

First server who introduce the menu- He already know that this is our first time here, he should come back to us an follow up if we are ok.

Clearing of dishes- Servers should all ask if they could clear the dishes before taking. They should not cross me at my front and clear the dishes for the person next to me, when they could walk to the other side of the table.

Main situation- The supervisor should ask if we are ok after it happened, should show some concern for your customers first. After picking up, should not comment on the wrong doing or even anything on the situation. When placing the standees back, should have done it gently and not show any unpleasant facial expression.

Overall, bad servers, bad attitude, bad experience for me and is in a Japanese Restaurant.
Probably, standees have been always dropping onto the ground when customers cannot find a place to put the menus when they are enjoying their food. If you already know about it, think of remedies and not vent anger whenever this happens.