The president nominates Supreme Court justices, the senate holds hearings and either rejects or confirms them. That happened, if you want to bitch about timing go back to when democrats begged RBG to retire when they could have replaced her with whoever they wanted. She absolutely refused, she knew how many times she had postponed the inevitable due to her cancer, but would not step down..
There’s your beef, that and Reid changing the senate rules, the republicans didn’t change any rules to get the nomination through, they simply followed the rules put in place by the democrats