Is it true if you don't pray your dua's are not accepted?

One day, the Prophet saw a man and he was making dua. But then he said that this man, the food he eats is haram, the drink he drinks is haram, the clothes he wears is from haram money. So how does he expect his dua to be accepted? The hadith collected by Muteen Mir. So what does this show us? It shows us that if we are sinning, if we are making mistakes, then this decreases the likelihood of our dua being accepted. It doesn't necessarily mean our dua will not be accepted, but it definitely decreases the likelihood of our duas being accepted.