Actually, if you go back and watch, when Juliette first woged in front of Nick she was barely holding back tears and terrified the entire time. And do you know what he did? Instead of talking to her about it, about how she felt about it, about whether she was okay? He immediately started asking how she could get rid of it.

Which may make sense at first, but bear in mind that this is after Juliette has found out that she can’t get rid of it and she hasn’t really come to terms with that yet.

When she tells him this, that she’s already tried so hard to get rid of it before even telling him about it because she was terrified for her life? You know what Nick does then? Well, he makes it all about him. He’s mad that she didn’t come to him first, he’s upset that she’s like this forever (with no regard to how she must feel).

Then he walks out and leaves her there alone, crying.

The scene you’re referencing, where she wants him to “accept it right off” actually happens later, after he’s had time to think about this and what it means, and how he feels about it, and how she might feel about it.

People tend to conflate those two scenes and combine them in their minds and think that Juliette was too hasty, but Nick had time by that point. He was just too busy making it all about what this would mean for him to care about what it meant for Juliette. And that was one of the main factors that fueled her downward spiral.

If you go back and watch that whole mess, Nick at no point considers how Juliette must be feeling about this. She immediately becomes a problem to solve rather than a person with feelings, starting with the moment she reveals the truth to him. And in the moments when Juliette crosses lines, that’s what she’s thinking about. That’s not even my fanon interpretation. That’s canon.

When she pulls away from Nick and the team? It’s because Nick ran away from her and wouldn’t talk to her about it, but he told Hank and then basically forced her to tell the team whether or not she was ready.

When she laughs in his face after he says he still loves her? She tells him to answer his phone, go hunt down bad Wesen, be a Grimm, because that’s what he’s good at. She rejects the notion that he loves her as ludicrous. She’s realized it’s just empty words to him, and she tells him what made her realize this: that he has never been there for her the way she was there for him.

When she burns down the trailer? She remembers Nick’s rejection of her, his inability to accept what had happened to her even though this entire world of his is what caused it, and then she attacks the biggest connection to and symbol of that world he has.

When she sends that email to Kelly and sleeps with Kenneth in her old bed? She’s surrounded by the place that used to be her home, looking around it and remembering her life there with Nick, and she’s doing things that betray the emotional and physical connection they had: sleeping with another man in their bed, breaking his trust by luring his mother in for the Royals.

TL;DR: This kind of got off-topic, I guess, but the point is that no, Juliette did not want Nick to accept it right off. He had time, but Nick never actually tried to accept it or treated Juliette like anything but a problem after he found out, despite claiming to love her. Which is why many fans find his easy acceptance of the notion of Adalind–who he doesn’t know how he feels about and who has actually done a lot of damage to him and his (including Juliette, by the way) in the past–getting her powers back ridiculous.