Late response... I understand the inflation, but poor people are not less affected by the inflation that the rich. Rich people can invest in more inflation-protected goods, like gold or houses. Poor people can't, they're directly hit by price increases of food or movie theaters.
Inflation means that can buy less with each dollar they have.
When the government adds to the currency without adding any actual value, usually by printing money, they're "inflating" the amount of currency available and actually making every existing dollar/pound worth less. It affects everyone, rich or poor.
It's a way of taxing without actually increasing taxes, and to my original point, rich people don't like it.