People can be angry or upset about more than one thing at a time. And you've no idea whether the person you responded to has been outraged about the US' strikes or not. Just because a society as a whole has a viewpoint that trends a certain way doesn't mean you can assume each and every individual you talk to has that exact viewpoint.
By all means, criticise society as a whole - it's a very valid thing to be critical of. But making assumptions about individuals - and being rude to / critical of them based on those assumptions - isn't the way to win anyone over.
If everyone's super(rich), no-one is.