When this was announced, I read part of the manga, then part of the LN original, and thought it might be good. I don't normally watch currently airing anime, but I was keeping an eye on this. And I finally dove in and caught up on it last week.
This episode highlighted pretty much everything I loved about the series as a whole.
Anna is awesome. Let's get that out of the way first. She's easily my favorite FMC in years. And she was especially good in this episode. It's just been so pleasant to watch her and Nukumizu get so comfortable with each other, and it was nice to see that in full flower in this episode. And I couldn't help but laugh when she lost her imaginary boyfriend to an imaginary rival.
Kaju is awesome too, and it was great to see a lot of her in this episode.
And the senseis. I would've liked to see more of them all the way through, but at least they got a bit of extra screen time in this episode. They're both interesting characters in their own right, and they have a great dynamic.
Chihaya was especially good in this episode too, even though she only got a few seconds. She's been a pleasant surprise - she just looks so sweet and naive, and she's so very much not.
Overall, the only criticisms I might have of the series are that a couple of character quirks were a bit too exaggerated (Komari's stutter and Yumeko pretty much as a whole) and that it seems like very little was really settled. The pacing wasn't really a problem in and of itself - I actually quite liked it - but it means that we need at least another season, and preferably a few more.
Overall, I was very impressed, and this was a good cap to the season, assuming another season is coming. Without another season, it'll be a bit disappointingly incomplete, but even then, it was a good slice of life.
You're faulting a series for a problem that exists because of assholes.
Every medium has its instances that are provocatice or scatological or otherwise offensive.
The difference with anime is that there's a group of assholes who base part of their identities on their purported superior taste as evidenced by the fact that they hate anime, and there's enough of them that they've formed a fairly significant circlejerk. And they latch onto things like this to which to point as supposed examples of the medium as a whole, while self-servingly ignoring the other 99.9% of stuff out there.
So yes, in a sense, there is a problem with the fact that things like this exist, but the problem isn't really simply that they exist, but that there's a fairly significant group of assholes who can and will dogpile on that fact.
If you want to blame someone or something for the problem, don't blame the series - blame the assholes.