On Season 10, when Nnoitra thinks back to when he fought Nel last time (when he broke her mask), he got her to fight by hurting Pesche and Dondochakka. Seeing them, Nel said that Nnoitra had ripped off their masks. However, Pesche and Dondochakka are Fracción and thus Arrancar, so their masks have already been removed.
Can Arrancar not fully removed their masks? If not, then how is Nnoitra ripping off Pesche's and Dondochakka's so bad that it was enough to bait Nel into a fight?