Voracek is obsessed with him. Doing some reading, looks like Voracek reads through Flyers GDT's and has been calling out dead head since 2018
Just some GDT posts from 2018 that pissed Voracek off:
"Voracek gets worse each year, he either can't or won't shoot, and it hurts the two young players on his line and it hurts the PP"
"Just pointing out that Voracek has the worst advanced stats of any player, so he should be "called out" as a terrible veteran."
"Colorado is really quick on the attack, they're gonna make a lot of defensemen look bad, but what cost the Flyers this game was the inability of our top skill players to finish in the offensive zone, Giroux, Konency and Ghost blew a bunch of chances, but the worst offender was Voracek, who looked like dog crap. Colorado is an awful defensive team, you have to take advantage of the scoring chances they give you."