I've seen both used often but 'Looked on' appears to be more used in books, poems and such. Meanwhile, 'Looked at' I see almost exclusively in news, articles, and others.
English is my fourth language so pardon any misunderstanding.
Thank you.
Top answer
com/us/definition/american_english/look-on CJ
— CalifJim
com/us/definition/american_english/look-on CJ
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