If the Ancestors met the Alpha Trolls, would they be disgusted at how they became? Like The Sufferer expressing disdain at Kankri because the latter is highly judgmental?

Some of them would! Not all of them though, I feel Condy may be okay with Meenah. Disciple and Meulin may get along until Disciple hears Meulin talk about her relationship with Kurloz. Highblood and Kurloz may high-five. Horuss and Darkleer are mutually disappointed.