Because Wally's jerkish personality practically stopped during Waid's run and became a more traditional version of The Flash (Pretty much like Barry was and is not like he was completely devoid of personality pre-COIE).
And this is not the only personality change that Waid would do during his run since both Wally's parents became one-dimensional spiteful people instead of the complex characters they were during Messner-Loebs' run (especially Wally's mom, you could make a case that Wally's dad deserved that treatment but Wally's mom was just a flawed woman who really cared about her son).