Can I make a potential counterpoint that has only lightly been touched on here?
I actually agree with you that the name is insulting. But I think it should be and I think the joke doesn't work if it isn't. In-game, the Asura who made it is such a narcissist that he not only plasters his own face everywhere inside it (Moto), but he even plays the part of the princess as well (it's just him in a wig). And pictures of both abound.
This Asura is absolutely insulting the people who pick this mode. And it's in character. And this is an RPG. Instead of letting the anger you feel boil out into the real world and affect you, channel it in game. Beat his dumb infantile mode, collect those baubles and force him to begrudgingly hand over the prizes. Smugly look down on him for every single bauble or zone you clear on Normal.
What I'm getting at is, instead of letting this become a sticking point for a potential bad time for you, let it become a storytelling moment. Embrace it. Have some fun with it: if your character isn't an Asura, how does this affect their view on the little sharks? If you are an Asura, how will you get back at Moto?
And then stepping back outside of the realm of roleplay, GW2 is a community game with so many players willing to step in and help. I promise you so many of the HPs out in HoT and PoF are outside the reach of some players and without those trains they'd never get them - but no one shames those players. People eagerly help those players get it. SAB is no different - your fellow players will help you. Their options to help may be more limited but if they needed to checkpoint port you across the levels I'm sure many players would have no problem doing so.
There's a beauty in humanity that even if some of us struggle with tasks, many others have an abundance of strength or skill in that same task. All of us need a hand sometime, whether we have an officially diagnosed disability or not. Asking for help is not weakness or shameful. I think you'll find more success in asking for a hand up the mountain rather than asking the mountain to be moved, in the end.
Also quick edit for clarity: I LOVE the name. I DO NOT want it changed. It needs to be this blatant for the joke to work. Calling it something like "Fluffy mode" or simply "Easy mode" completely loses the actual joke and then it's just a mode. Infantile is so over-the-top in its description.