Well I think its because its easier to get to Wings than it is to DSP. Despite how much people hate Wings he still has real life family and friends around him who he talks to. He still keeps voice chat up on multiplayer games, his wife is very visible and has her own social media shit. He's even said that he would go out and have a meal with a fan if the situation was right.
DSP has literally isolated himself in the name of making money (and blowing it) in the laziest way possible. No friends. No family. We haven't seen his wife on anything in well over 3 years, he doesn't touch a multiplayer game unless he can turn off everything to contact him, he has no other hobbies, and he rarely goes outside. there's not really much else you can do to troll Phil nowadays since he essentially just let trolls control his entire life.