In regards to the issue of the mom's behaviour, and the influence she has on her kid I agree with both opinions
@SuzuPazuzu and @Suban above, though not tit for tat. It's very clear Riho's mother has some deep seated issues, that are being a bad influence to her child, destroyed her marriage and make her a toxic person, but if you take her in consideration as a human being and not just a character with a narrative purpose (we can look at her as both, np with that), you have to take in consideration that this is a complicated matter full of nuances. The behaviour we see of her is obviously toxic, and of course it is as it's what comes to Riho's mind when she judges Fushimi as a person based on the way she acts, because it reminds her of her dad and consequently of what her mother says about him and people like him according to her. Unfortunately, we don't see the mom's perspective, backstory, or other situations with her, therefore it's easy to think of her as a villain, but that's shallow thinking.
If you take a look at what we can see of Riho's home and her room, we can see that she's a hardworking girl, and that she and her mom are doing well materialistically speaking. You can see that she has plushies, drawings on her wall, photos of her and her classmates (probb just graduation pictures), etc. You can take that as her mom being present (even if overbearing, verbally abusive, toxic, etc.), and hardworking to provide for her, as it looks like it's a single parent household and there's no way to know how much the father is contirbuting to their situation.
Of course, this is all my interpretation, and given the info we're given, there's only so far we can go. A bit of a shame that we didn't really get a conclusive positive turn for Riho in this chapter, though we can see Fushimi did give a bit of a positive influence to her. Maybe we'll see more of her in future chapters.
As always, thank you very much Good Try Scans for the scanlation. I really love this series.