User blog comment:B214/High School DxD EX/@comment-187.209.54.66-20160209191916/@comment-3435913-20160209205323

It's not that they hate Ascalon, but considering they want to be recognised by their own merits, they would choose alternate weapons so they can stand out on their own instead of being simple called "Issei's Kids"

(Plus considering its both a Holy and Dragon-Slayer Sword, it probably would sting like hell being in its presence, let alone fighting with/against it, since the original was only modified for Issei to wield.)