Here in the EU, you have to pay for the electricity and for the water, so people are not keeping freezers or taps open. You have to pay for the food as well, I never heard about your 40 %.
It doesn't matter if you have to pay for electricity and water because you can easily earn enough money to leave both the lights and taps on all day. That doesn't make it right.
The point is that if we start calling other people hypocrites that road leads to the realisation that everyone in the west is a degree of hypocrite. We're in this together to a greater or lesser extent.
It does matter a lot if electricity and water is free. It would be wasted much more if it was free.
I think it is important to call people hypocrits to make them think about what they do. We are in this together, so we must explain stuff to one another.
Its up to you whether you want to believe me or not, you have access to Google. We do apparently waste up to 40% and IIRC it was a pretty official report. You don't even need to verify it though, its logical, just think about the process of supermarket food availability. The design of that process is both bourgeois and wasteful by design. We eat fruit and vegetables OUT OF SEASON all year round. Its weird if a supermarket doesn't have what we want in stock. We have black rubbish bins. Just think about all of that and realise that as a society we're inherently wasteful.
If we genuinely cared then we wouldn't live in a world like we do.
For example: every time you take time out to save remember the student flat my brother once lived in where they didn't bother de-frosting the freezer and just left it open, forever trying to freeze the world. We try to save water in our house yet three doors down the guy who washes his car leaves his hose running for ~30 minutes every now and then. How can I hate the people of the world that do that when its permitted as a norm? When the developing world has a burgeoning population poised to make those same mistakes again? Its a very sad problem of scale. I'm not saying don't try, more just try not to mad at people when our culture enables it so.
Let this person have their silly blog. The problems are so fundamental in our society that this represents some of the least harm. We should focus on regulation and culture instead. For example the 40% of food waste that the EU practices is an example of an institutional problem worth the effort because the gains are immense.