Must a young man grow his beard despite his parents' objection, or should he trim it to avoid argument and falling into disobedience?

Raising one's voice at a father, quarreling with him, and angering him are not permissible in the religion of Allah the Almighty, even if he is committing a sin. Al-Ghazali said: "The child has the right to enjoin good by the first two ranks: identification, then admonition and advice with gentleness, and he does not have the right to enjoin good through insult and harshness." Sheikh Al-Rajhi said: If the father commits a wrongdoing, the child may command him and forbid him through admonition and advice with gentleness and kindness in speech, and he may not confront him with intimidation, threat, beating, insult, or harshness; because Allah has linked His right with the right of parents: {And your Lord has decreed that you worship none but Him, and to parents, due excellent treatment.} Excellent treatment towards them is obligatory, even if they are disbelievers, provided they are not obeyed in shirk. Gentleness in speech, compassion for them, and prayer for them are obligatory. Filial piety is more obligatory than growing a beard. Therefore, the questioner must adhere to proper conduct with his father, while growing his beard, and that is with gentleness, kindness, patience, and wisdom.