B.G 9.30 to 33
Even if one is extremely ill-behaved, if he worships Me with exclusive devotion, he is to be considered saintly, for he is rightly resolved.
He quickly becomes righteous and attains eternal peace; O son of Kunti, understand conclusively that My devotee never perishes.
Even those of sinful birth - women, merchants, and labourers, if they take refuge in Me, O Arjuna, they too attain the supreme destination.
What to speak then of virtuous Brahmins and royal sages who are devoted? Having attained this impermanent and joyless world, worship Me.
Gīta Bhāshya 9.30 to 33
The Lord devotees generally does not misbehave. But because of unwinding of karma, temporarily he may misbehave.
Generally, a devotee does not become extremely ill-behaved; yet, because of excessive merit, somehow, he does, even then he is to be considered saintly.