'Right!' might be a simple affirmation. 'Right...' can also be used in a sarcastic, ironic manner, indicating the speaker's actual feeling of disbelief.
'Right?' is used to seek confirmation, or perhaps to prompt a person with the suggestion that agreement is expected.
All long-standing usage. Fashions and fads in language do not, to the best of my belief, constitute evidence that 'something is afoot,' in the sense that someone is manipulating usage to further some agenda.
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If you Love Liberty, you must Hate Trump!
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