Loki was looking at her "I do drink it sometimes, but i am a very light weight and can get easily drunk. Probably would take 2-3 and Id be drunk and quite sick later." He laughed a bit "Thor can handle much more, I've seen him down quite a lot."
He knew it took much longer for his brother to become even the slightest bit drunk. It was rather amusing a lot of the time. Loki really did think a lot of his brother though. Even if there was times that he was mad at him.