Nah, while most people do (objectively and statistically) prefer the female protagonist, a good portion of that group also are just fine with watching with a male protagonist.
No, the thing that put people off is the other questionable decision they did- making a completely new scenario for the anime. Apparently the mindset was that it would cater to both newcomers to the series and viewers familiar with the source material. For the former, it was supposed to pique their interest enough to make them want to play the game or read the manga; while for the latter the all new scenario was supposed to surprise them and intrigue them.
In the end, what happened was that it confused both demographics with all the new stuff that they introduced. Didn't help that they tried to cram all the old world building and new story elements in 10 episodes with only 2 episodes per arc. Shame, since I thought the premise was good but the execution fell behind.
Not to mention, even if you somehow did prefer the male one, you didn't even get him in the anime. Instead you got the edgy boi version of him.