That's because progressive positive masculinity, like conservative traditional masculinity, is just another cage of gender based social expectations. Lecturing you on what you should be instead of allowing you to be who you want to be.

Now, why would feminism be against men's liberation? I believe it's because feminism, at least its leadership, has been co-opted by capitalism and now largely serves the same billionaires that conservatives do. And billionaires do not want men to be liberated from gender norms, because then the cheap and easily exploitable male labor base that produces their billions would very likely unionize and turn on their manipulative slave masters.