SpongeBob is funny, a good bit of the time, and female comedians are generally seen as boring, especially from older male audiences.
And as I’ve sat through some female comedy specials that have not been that funny, I can see where the stereotype comes from. So, if it’s something I couldn’t tell was written by women, and was funny, then there’s a use for saying such a thing.
If you haven’t come across that, you’re not seeing the hecklers our there.
There’s definitely a time and a place. Speaking about diversity in the workplace is all well and fine, I mean, for some little girls knowing a woman wrote a funny Spongebob episode could be inspiring. It only becomes a problem when your content reflects your serious attitude towards what you’re trying to convey. There’s nothing wrong with making fun of yourself, or your characters. In fact, it’s what humanizes them! It’s arguably the best part of animation. But when you begin to take your work too seriously, or fantasize about your ‘groundbreaking’ content, it’s sort of obvious in the writing when the writers have an ego boost.