How do you handle people that are nasty but pretend to be nice Christians that hide behind the scriptures they reference from the bible?

I just accept them for the misguided hypocrites that they are. Nothing to be done about it.

With understanding, compassion, and patience. You should be aware that people are normally good and nice by nature when they are healthy. When a person is mean, this is a sign of brain damage. They are doing their best to cope with a lot of horrible thoughts that they can't help. Have some compassion.

https://www.youtube.com/watch?v=esPRsT-lmw8

If they act nice, I assume they are, having no way of judging otherwise.

The ones who act nasty, are deluding themselves that they have God's favor. But we all have our moments.

Walk away

Realize that they have to live with themselves and karma (or as the Christians call it, "reap what you sow").

I never met a Christian who had any moral values.

i ignore them

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