"妄提要求者" can be translated into English as "those who make unreasonable demands" or "those who make presumptuous requests".
"Unreasonable demands" emphasizes that the requests are not reasonable or justifiable.
"Presumptuous requests" suggests that the requests are made with an overconfidence or lack of proper respect for boundaries or norms.
Both expressions convey the idea of someone making demands that are excessive or inappropriate.