I don't think that's a Dominican thing.
It's the attitude of a young person (teens - mid twenties). I'm in this age group, so bare with me
Turning off lights should happen, you pay for it. (Unless you don't, then you do what you please).
Water..... I'm paying 20 pesos a month for my water in my building... I'll run it if I please. (I don't, but that's the attitude).
When I moved to this country, I didn't care at all about clothes (and was sloppy in my dress), the culture changed that. I buy brand names because I can afford it. I work with plenty of people that can't afford it, but dress very sharp, and you are still drawn to their choices.
Many "brand names" might be knock-offs most of the time anyway (my eye isn't for detail.