💡 Detailed Explanation
'をいいことに' (o ii koto ni) means to take advantage of a favorable situation to do something bad or selfish. He is using his position as department head as a convenient excuse to make unreasonable demands. 'をよそに' means 'ignoring' or 'paying no attention to' (like warnings). 'とばかりに' means 'as if to say...' and describes an action. 'にあって' means 'in the situation of...' and is used in formal contexts.