They don't care because you have given them a small amount but see to it if you'll be giving them hundreds to thousands of dollars worth of bitcoin, they will remember it and probably cash it immediately.

I guess the interest of woman isn't really into this but in the future, this might change.

There are two gaps to consider.

Bitcoin is widely treated as an investment asset, and women generally invest in financial markets much less than men:
Why women invest 40 percent less than men
Why fewer women invest in the financial market

Secondly, there's the technology aspect. There is a pronounced gender gap in computing and STEM fields in general, partly due to differing levels of interest:

They are, they just not as fixated on it as guys can be. My wife has her own bitcoin that she has had since 2013 in cold storage. She does not follow the news, price or anything. She has basically forgotten about it until I bring it up if the price is pumping or tanking. She is only interested in selling in a few years so does not care much about it now.

Because basically women always receive directly instead of waiting for one of the investments the reason why women never invest is because of the long wait process and most women are easily scared when assets go down so women are not suitable to be in the crypto world

yes maybe that's true because we know basically the nature of women is a teaser. lol 

so I think women of course they prefer to follow the trends of clothing and beauty compared to crypto technology, but before I also heard that in America more women are adopting bitcoin compared to men.

Not to stereotype, but most of women does not really care to technical details, but only cares if a thing works or not. As long as something works, they'd use it, and if they don't see any use of it in the future, they would just forget it after they got what they want. They tend to focus more on other things, while men tend to be digitally oriented since more men are attracted into PC/digital world early on, hence why more people in the IT field and such are comprised of men. If Bitcoin would get adopted more wide-scale, then we might see balance of men and women's usage percentage if the future.

This is the wrong mindset to have, it's the payment option that is the problem here, not the amount of money. Getting 300 dollars in any currency is going to turn heads, and if the ladies got 10 dollars in fiat, they would have likely just pocketed the money.

Even though this is a pretty small sample size, it's fairly accurate and representative of the scene. Women are statistically less interested in investments, compared to men, and since BTC is usually seen as an investment nowadays, women aren't going to interested in it.

I'd like to add a potential third fact, women usually tend to value fiat. Having several digits in their bank accounts available to spend is more important for them. (Hey, this is my observation, don't flame me for this. Speaking from experience) holding a "virtual game money" for years and waiting for it to gain value is a no-go.

Women in general are looking for stability and not volatility which is exactly what Bitcoin as an asset is giving us. Plus maybe we have to look into the technical side of cryptocurrency to see if complicated mumbo jumbo is not another factor turning off many ordinary women to come onboard this industry. I am not saying that women are not open for change but maybe women are more wired to traditional way of doing things but this can be changing with the millennial generation where women are more aggressive, risk-prone and more adventurous, the right kind of attitude or mindset which Bitcoin can easily appeal to. Welcome more women to this whole cryptocurrency industry can be transforming its flavor and texture for the better.

You cannot say that because I am sure that in other places, women are interested in bitcoin, and they can learn by themselves. Perhaps, you choose the wrong women, so you feel they don't care about bitcoin. You can search the other women and teach them about bitcoin and let see what will they said about bitcoin. And if the other women will be the same as the last women that you taught, then you should search for the other women.

We can not generalize some women to be all of them because we are not search for in other places so we can conclude that women are not interested in bitcoin.