Okay, okay, we all hate Luther and love Klaus. But here's a full list of times Luther was a dick to Klaus in canon (feel free to add):
Barely greeted Klaus when he found him in their dad's office and showed disgust for his addiction even though he probably knows full well why Klaus needs the drugs
Didn't notice when Klaus was kidnapped and tortured for at least one full day and night. Only realized because of external factors, and even then barely batted an eye when Klaus reappeared and did not check on him
When Klaus was displaying clear signs of PTSD, did not offer any help and whined about his own problems
On that note, when Klaus was obviously in withdrawal he continued being rude to him about it and asked him for drugs. While he was trying to recover from addiction. This might be the worst one
Told Klaus he wanted to be like him, implying the addiction made Klaus happy and carefree, although again he probably knew fully that it was extremely hard on Klaus and the only way he could cope
When Klaus tried to stop him from going to get drugs, he physically shoved him across the room to the ground
Also choked him and lifted him off the ground by his throat on a different occasion
Implied Klaus was worthless and not trying when he was unable to get in contact with their father
When he finally did get drugs and made irresponsible choices in a club, including revealing his monkey body, Klaus came to find him despite his own PTSD and withdrawal. When people came to attack Luther because of his carelessness, Klaus fought harder through all his issues and tried to fight off the attackers. They ended up killing him and Luther left him there to go have sex
When Klaus came back to life he had to find his way home and Luther never asked about what happened to him
When Klaus said he'd seen their father, he was dismissive
He was even more dismissive and even acted offended when Klaus said he'd been seeing Ben, even though that is his actual power and he had been clean for the longest period of time since their childhood
Left Klaus at lookout duty, with the implication that he would not be of use in a fight
There's probably somehow even more than this, so please add!
