It can be truly difficult to tell if Lukas is being kind or crude when he addresses others. Calling someone a garbage can obviously comes off as rude, especially when that's what the tone suggests. But then later you might hear I love garbage cans . He wants to be liked, and craves attention, and might become cruel with his words when he feels he is not getting that. He truly just lacks the knowledge of how to interact with others, and it can be difficult not only for those around him, but also for himself. It is only in exceptionally rare moments of calm clarity that he can express himself honestly, and some might not stick around long enough to find that out.