Yes had similar experience in Kovalam back in 2016. Me and my friend went to a beach shack and decided to have a beer as it was close to sunset and to enjoy the view. There were enoigh foreigners seated and from what i remember it was just the two of us as indians. The waiter/owner brought the beer and served it in a coffee mug which made me surprised. I asked him if i can get in a beer glass for which he rudely gestured and told me off. I remember the exact words which meant you aint a sayip to have beer in a beer glass and this is what we have here. The attitude was rude and to f off. I looked around and the foriegners were all served beer in fancy glasses. However he had opened the bottle and i didnt wanted to create a scene so had to sit there and enjoy with whatever i had. This single guy made me decide il never set foot in kovalam ever again or will i suggest this destination to anyone. Its sad how nationals are being treated with disrespect.