Except you are.
You made an objective statement on the show. That statement is false. You are now going "It is just my opinion." That's hiding behind opinion.
We can argue over opinions, that's fine. However, you want to argue over facts and want to treat opinions the same level as fact.
This is going back to you have admitted you feel interpretations of events are all equally valid views. This is not the case.
If your statement was "There are too many men portrayed negatively" that's an opinion and we can argue what qualifies as negative and how numerous they are.
But, you claimed almost all and universally that men were portrayed negatively ... which is objectively false. It doesn't matter if that is your opinion, when I tell you it is false it isn't because I disagree with you, it is because it objectively not true.
You are arguing that all opinions are valid and should be treated as such. But this entire argument has been your opinion vs people telling you the facts of the show. This hasn't been an argument of opinions.