We had a one day cruise to Halong Bay on 12 May 2024. About 1/2hr into our bus ride, we needed to use the restroom so we raised it with our tour guide 'Lion'. He asked us to wait for 15 minutes. 15 minutes later, we were still on the highway and passing several rest stops along the way. So, we raised it again with the tour guide to stop somewhere as we had to go. At this point he yells at us in front of all the other tourists in the bus saying "do you want me stop on the highway?! " We asked him to lower his tone and tried to explain to him that we just saw several rest stops and we had to use it urgently. He continued to yell at us saying he can't stop on the highway even though we didn't even want that, we just wanted them to take us somewhere appropriate. We reached the rest stop not even 2 minutes later, so he could have definitely said something better like, "we're reaching in a minute", or something along those lines. At the rest stop we got in touch with management and they seemed to call him up to assess the situation. He approached us after the phone call in a highly combative demeanour, got even more argumentative and said things like "did you want to stop on the road to pee on a tree" or "leave if you have a problem" at the rest stop. He ignored us for the rest of the tour and deliberately did not offer us water, while he offered it to all other tourists right in front of us. No matter what the situation is, this is not the kind of service we expected from a hospitality cruise. We were looking forward to a cruise in a beautiful country like Vietnam, and this was super disappointing.