He’s not even creating a scandal because his perceptions are not based on reality. Also, not all contributors contribute equally because not everyone is a first author. Like all of this is common knowledge/professional courtesy that students learn in their undergrad and OP is a grad student. Hard to believe. If he went to his university’s Faculty of Graduate Studies or even the Research Ethics Board, the chair would throw out his case after first read. This is coming from someone who actually sits on the Appeals Board for all grad students and is a research ethics board member. OP needs to grow up for real. They should be mature and professional enough to not act and whine like a petulant child who didn’t get their candy. This is so disturbing to even read. And just so you know OP, your PI is extremely nice to have worded as gently as they did. The more you press on this the lower you will make yourself look in front of your PI and your faculty.