What an Ingrate!

Over the past year Rastenis has summoned me to help him with various things, each time promising a bottle of vodka as payment. It's taken him a ridiculously long time to square up. When he finally did last week, he showed up with three bottle of black pepper vodka, which is undrinkable. He can't even drink it himself, but he can use it show his gratitude for services rendered. I've never used this word before in real life, but Rasteni, you're an ingrate!