Does the obligation to denounce evil fall away from the one who denounces it when facing people who respond to his denunciation with mockery and rejection of prophetic hadiths, claiming that religion must be open-minded?

Enjoining good and forbidding evil is an obligation upon every Muslim according to their ability. This obligation is not waived by a lack of memorization of evidence, as long as you are confident in the forbidden nature of what you are denouncing. If the evil is within your family, you must educate them and forbid them gently and wisely, warning them of what incurs Allah’s wrath. Their surprise or mockery should not deter you. Ensure that the evil is manifest and not hidden, and that the one committing the evil is aware of its prohibition. Scholars have differed on whether the obligation of denouncing evil is waived when one is certain of non-responsiveness, but the preponderant opinion is that it is not waived, as it serves as an excuse to Allah. However, if the prohibition of the evil is a matter of scholarly difference, and the perpetrator believes it to be permissible, then there is no denunciation against them, unless their supporting evidence is weak.

It is advised to continue advising relatives with a gentle and lenient approach, warning them of Allah’s punishment. When addressing parents, one must humble oneself before them and remind them of their reward for encouraging their children to do what pleases Allah. It is possible to avoid speaking with them when they are gathered and to focus on individual da'wah through publications and recordings, while seeking Allah's help and supplicating for their guidance.