Firefly Bar

#songkran2024 We visited Firefly bar on the night of Feb 23,2024. We had our first drink which were Banana Joe and Elegant lady in red. Overall experienced was good. However, when we order our second drinks (Forget me Not and Firefly Rebirth) as the waitress about to serve our drink she informed us that "we ran out of our rocks glasses" the two glasses were small thin layer which completely ruined the whole presentation of our drinks. The waitress did not apologize as if this is completely acceptable by Kempinski Standard. Why don't Kempinski serve our drinks with red plastic cups instead. We ask the waitress to take our second drinks back as we are not okay with these type of glasses. The waitress took it back and informed us she will asked the bartender to find rocks glasses for us. To add insult to injury the waitress came back with our drinks in rock glasses that are warm (not chilled straight out of washing sink) we believed they just pour our drinks from the old glass into the new rock glass. We were disappointed with the whole experienced we had at the Firefly. We dropped three grand that night for mediocre drinks, food and service.