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(to be) disgusted with (someone/something, oneself)
(to be) disgusted by (something/someone)
(to be) disgusted at (something/someone)
(to be) disgusted in (someone)
All of the above are valid.
It's also valid to use no preposition.
(to be) disgusted (followed by 'to see,' 'to hear,' 'to find,' 'to learn,' etc.)
(to be) disgusted
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