When I asked my mother as a teen, she said it "would make act like a hoe" and I recently bought one out of spite.
So, do you act like a hoe now?
My Mom didn't want me to watch Ed, Edd, and Eddy or CatDog because she thought they were stupid.
She was right.
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My mom didn't get me rollerblades (even the poor kids had them, no rollerblades meant I couldn't hang out with classmates) or a skateboard (I wanted one because of Back to the Future), because they were "dangerous". I bought a skateboard with money from my first job, and rollerblades last year, when I saw a pair that looked cool. Both were underwhelming. (They were cool with bikes, though, and bought me four bikes. When I grew up, I bought five more. Bikes are awesome.)
I say "first job", but that took a while, because my parents also forbade me from working -- specifically, they told me that if I worked, I would have to pay for my share of the rent and food (and there wouldn't be much left from an underage child's salary). They also threatened same if I went camping (I was 16 and already bought camping supplies with the $500 they gave me for a perfect GPA), RIP my social life at university.
My dad in particular insisted on buying me "nice" clothes, to "cultivate a sense of style". I was not permitted to wear them except for special occasions. But my ex-sister, having got them as nearly-unworn hand-me-downs, was allowed to wear them every day and looked great, and resented it. Generally, I served as a trailblazer for her, every permission I had to fight for she got for free and two years earlier for her age.
When I was 13 or so, we were at a clothes market and they made me try on an awesome red coat. It fit perfectly and wasn't particularly expensive (come to think, it looked like my waifu Maetel's coat, but without the fluffies). Both mom and dad were horrified to see how "adult" I looked (it wasn't a slutty coat) and refused to buy it. I credit this incident with destroying my enjoyment of clothes. I wear jeans in winter, fast-drying pants in summer, and moisture wicking t-shirts. As for slutting, I ended up losing my virginity at 32 to Surgitron® Dual RF™.
I also remember a vague notion that coffee wasn't good for children, but we rarely brewed it and I didn't like the taste. (Holding the button on the coffee grinder was fun.) I drank, and still drink, gallons of unsweetened tea with lemon slices.