Byrne basically demanded ALL Doom Patrol appearances be erased from canon and that his run would be their debut and even strongarmed Chris Claremont into collaborating with him to reboot Doom Patrol with a six part arc in Justice League to set up the reboot.
Sadly, this pissed off a LOT of people internally and externally. Geoff Johns was allowed to ignore Byrne in regards to Beast Boy in Titans but was embargoed from using the Brotherhood of Evil; though Geoff did use the reboot to undo the bullshit deaths given to Brain and Mallah and had them referenced in a flash Identity Crisis tie-in (with ID Crisis also featuring a new version of Phobia who was the girlfriend of Batman/Wonder Woman villain Dr Moon)
Byrne further shitted the bed by giving everyone new looks (in particular, Negative Man was a leather gimp) while at the same time, shoving down readers throats new OC characters. Oh and Cliff is a pedophile/making out with a teeage Rita storyline that embodied the worse excesses of Byrne's sex stories.
The worse thing is that Byrne didn't have to fucking reboot shit. All he really had to do was just fucking reunite the OG team and in the case of Rita, write her a proper resurrection story and in the case of Larry, come up with a story to unfuck him up after Morrison ruined him by turning him into Rebis.