Using 'presume upon' implies disapproval of someone's behavior, usually selfishness or rudeness.

Negative Connotation

'Presume upon' suggests an expectation that others will comply with the presumption.

Implies Expectation

Sometimes 'presume upon' can imply initiative in informal settings; the tone is key.

'Presume upon' means acting on an assumption that isn't clearly agreed upon by others.

The phrase often rests on logical deduction rather than concrete evidence.

Be wary of using 'presume upon' when certainty exists; it's for probable situations.