They were regarded as traitors to the faith by many Catholics, including the pope and Queen Marie Antoinette—who famously refused to confess to a juring priest while on the gallows for her execution, thinking it would be an invalid sacrament.
A juring priest who assumes a function in the spiritual order was regarded an "intruder", a "rebel".
The Pope recommended that jureurs should no longer be admitted to the clergy unless they were completely recantation and underwent severe penance; some bishops went so far as to definitively refuse any reconciliation to "schismatics".
In Catholic regions, especially in western France, jureurs were ostracized by the faithful and sometimes driven out by peasants with pitchforks.
[2] Famously, Queen Marie Antoinette refused to confess to a juring priest while on the gallows for her execution, convinced by the papal instruction that it would be invalid sacrament.