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Sasha,
Don’t let them get to you. Leave them in the Lord’s hands. 
Like you said, they probably live miserable lives and can’t do anything constructive themselves so they bad mouth others and complain and whine about everything. :-X
One day they will meet their Maker and let’s see them explain their ways to Him. “…throw that worthless servant outside, into the darkness, where there will be weeping and gnashing of teeth” (Matthew 25:30 NIV). :o