I was told once in church to count up how many taps delivering clean water inside my house I had, including the shower, taps attached to the washing machine, dishwasher, boiler etc (I count 10 in our house). Having more than 1 puts you in the top 7% of the world.
Now, I don't think it's reasonable to say to someone who is living in grinding poverty in the UK, having to use food banks, going hungry, sitting in a cold damp house that they can't afford to heat etc that they are rich because they have access to clean drinkiing water inside their home. It's that smug "1st world problem!" argument.
And here's the thing, many people in the 3rd world have a better lifestyle than those in the 1st world. Many people in poor countries with a £19k income will have servants, a large house, pleanty of food, access to health care and good schools for their DCs.
Money is worthless on it's own, it is only worth what it can buy. In this country, £20k doesn't buy a lot, in many other countries, it buys a great lifestyle.
You sound like ths sort of smug person who belittles other people's problems and tries to make people struggling feel worse about their problems because if they aren't actually going to die that month or not have any access to food for a week, then they aren't 'properly' struggling.
People on £20k in this country with children are probably going to struggle financally, telling htem they are 'rich' so should be helping out the 'real poor' is rather unkind.
Oh and in this country, everyone earning or buying anything with VAT is paying tax. Part of that tax is spent on development aid. They are helping out.