This is a common criticism towards the men described as "nice guys". They are consistently accused of wanting to use women just for sex if they're ever pissed at being friendzoned, or just rejected by women in general.

On the other hand, dudebro who spends most of his free time at the gym is a hundred times more likely to pump and dump women around him. However, he hardly faces close to the same criticism "nice guys" do.

Most "nice guys" actually want to love and to be loved. Some of them may be desperate and/or clingy, but they're not actually thinking about using women as cumdumpsters.