Does GOD hear prayers from sinners

[Arturo Ortiz]

I just came across a part from scripture in Isaiah 1:15

From Scripture
When you stretch out your hands I turn my eyes away. You may multiply your prayers, I shall not be listening. Your hands are covered in blood.

Some people have claimed that god does not hear prayers from people who are in mortal sin. Wouldn't this just be from unrepentful sinners rather than from those who do repent.
For example in the passage of scripture in the Pharisee and the Sinner it says

From Scripture
9 And to some who trusted in themselves as just, and despised others, he spoke also this parable: 10 Two men went up into the temple to pray: the one a Pharisee, and the other a publican. 11 The Pharisee standing, prayed thus with himself: O God, I give thee thanks that I am not as the rest of men, extortioners, unjust, adulterers, as also is this publican. 12 I fast twice in a week: I give tithes of all that I possess. 13 And the publican, standing afar off, would not so much as lift up his eyes towards heaven; but struck his breast, saying: O god, be merciful to me a sinner. 14 I say to you, this man went down into his house justified rather that the other: because every one that exalteth himself, shall be humbled: and he that humbleth himself, shall be exalted.

Doesn't this just mean that it is the unrepentful sinners that God does not hear?

I have always been thought that everyone should pray and that the prayers of sinners are heard as much as another person's prayer.