They have blinded themselves.
When speaking to Calvinists, it is
not like speaking to someone with a different opinion or a different view.
There is a reason they must constantly remove their proof text from the surrounding context.
It is not a genuine discussion.
Those who are trained to employ many different tactics like redirection, post hoc rationalizations, cherry picking verses etc.,
They are looking for converts to the system.
They must present the system as being the ultimate truth, the highest level of understanding so that people will be persuaded by it.
Notice how they they will eventually come to "you are saving yourself" false accusation.
This is a tactic they employ,.....guilt, accuse people of taking glory away from God.
It is all psychological, and the people who fall for this false "system" tend to fall into a certain group.

Sometimes the "covert" part fails and they show who they really are.
It is really sad this system has become ubiquitous in the churches because it never used to be.