It is fairly relaxed but you should probably swap the ski gear for something a bit more decent. The service is top notch and it is a solid way to end a long day on the slopes.
Most of the local bars are pretty basic, so if you want a more upscale vibe, you should check out the local casino. It is probably the most professional setup in the area for evening entertainment and one of the best Gudauri places to spend your night . You can see what they offer and check the venue details at https://casinogudauri.ge . You can spend your evenings in a much better atmosphere than in the crowded ski lodges nearby.
good