We must be careful about money, if you are careful about money then there is no problem if people call you stingy because some people's job is to say bad things about others.
If you are frugal, you don't care what others say. As you learn to be frugal you will surely learn to improve your situation. If you don't listen to the negative words of people in the society and change yourself, you will never be able to improve your situation. Money is the most precious thing to spend your life. So money is definitely needed in every aspect of life. If you can use money properly then you can definitely establish yourself.
No matter how rich you are, you need to be careful with your money because there may be times of danger. Nowadays everyone earns money but very few people care about their earned money. Because people spend their earned money in various bad ways due to which it is seen that they spend more than what they earn.
So we should be careful with our money and even keep it as savings for future so that in case of danger we can use that money and get out of our danger.
You are right because our finances are not always the same. If you are rich today, you may not be rich tomorrow. So as you say we need to spend our earned money judiciously and even save so that we can enjoy that financial benefit in future. People are told to take care of their money and to save money so that they can put that money to good use later in life i.e. old age. Those who earn money at a young age and spend it in bad ways without thinking about the future may be doing wrong.
Just because you're rich doesn't mean you don't have to take care of money, that's not the case. Money is important at all stages of life, but when in danger, the need for money is most understood. So at least it is important to think about our danger and save money.