It would indeed be silly, and I'll agree with you on homophobic because that's the standard term for prejudice against homosexuality although there doesn't seem to be any phobia involved.
Is "being interested in unlimited animated boobs and asses" a negative quality? I would say yes. (Others might argue, but let's set that aside for the sake of this discussion.)
Is assuming something negative about an entire gender sex discrimination? Yes. It's practically in the definition. (Assuming something positive would also be sex discrimination.)
It is, therefore, negative sexism directed at men. I consider this to fall under the heading of "misandry". What do you think misandry is supposed to be? Because "negative opinions about all men (and only men)" exists, and I'm not sure how you can argue it doesn't.
Re: inb4 "DIE SCUM DIE"
Is "being interested in unlimited animated boobs and asses" a negative quality? I would say yes. (Others might argue, but let's set that aside for the sake of this discussion.)
Is assuming something negative about an entire gender sex discrimination? Yes. It's practically in the definition. (Assuming something positive would also be sex discrimination.)
It is, therefore, negative sexism directed at men. I consider this to fall under the heading of "misandry". What do you think misandry is supposed to be? Because "negative opinions about all men (and only men)" exists, and I'm not sure how you can argue it doesn't.