They probably want the person to go out of the house so that they can live freely that they havent beeing doing for years. The way they want the person to go out of the house and become indipendent from them varies with each family situation.
EXAMPLE: Seeing someone play with toys all day would seem to some parents that you aint doing anything with your life and that its going against the becoming indipendent thing...aka stagnant and cradled behavior.
Its a fairly logical mindest in families and cultures that come from a more traditional look at roles. Kids going out of the house and becoming adults so that they will be capable to sustain a family of their own. Toys represent a more idilic and carefree part of a persons life, when they had no worries of working 8 hours a day and coming home tired ready to just hit the hay (rince and repeat). This is what society expects of an individual to do.
There are exceptions to this rule, and its when you apply what was once your hobby into a substainable income...aka make cash out of kid market. But this is an exception and is very hard for people to get a sustainable income from this thats viable for taking care of a future family. Its also like being an artist, anyone can learn it and do it, only a few can be really good at it, and even smaller can pull through and actually make money of it in a sustainable way. At that point if you are constantly struggling to get income from something you liked as a hobby, you will ultimatelly start disliking it cause more often than not you will need to do whats profitable instead of doing what you are passionate about to keep getting revenue of it. (Which is why people that have artistic professions are more often then not unhappy internally because of these conflicts we what my job wants and what I want to do).
Now whats my personal situation with this. Obviously my family is indifferent with me liking Bionicle, TTV or any other passion free time thing. Its my hobby and something Im passionate about in my free time like anyone with their own specific things...so long as it doesnt distract me from doing things that are with no argument, more important like finding and working towards a sustainable and respectable job thats going to also sustain that enjoyable hobby that I dont want to just end entirely. If I find a job thats closely connected to what Im passionate about, even better, but right now they want me to focus on less risky ventures and I cant agree more with that. A balance of both is what keeps people happy while also moving forwards with more life challenges.
Fun little side note: They call them Bioniks or just Robots).