Could 看不起 work as the Mandarin equivalent of 睇唔起?
Is 看不起 a valid way of expressing 睇唔起


It is a direct translation

瞧不起/ 看不起 in Mandarin = 睇唔起 in Cantonese

瞧得起/ 看得起 in Mandarin = 睇得起 in Cantonese

瞧不起 is more colloquial; 看不起 is more literary