"Boys will be boys" has been deliberately conflated with a permissive attitude towards sexual abuse. Your use of what you thought was an innocent phrase describing rowdy behavior will be abused by activists as evidence of misogyny or rape culture. Together with "toxic masculinity", it's one of the ways male-associated behavior, or masculinity itself, is problematized, or in plain language, attacked.

It's second nature to walk home before the sun goes down; And put your keys between your knuckles when there's boys around - Boys will be boys, Dua Lipa - https://genius.com/Dua-lipa-boys-will-be-boys-lyrics

* The Danger of “Boys Will Be Boys” - Why this phrase should be banned from our vocabulary.* - https://www.psychologytoday.com/us/blog/gender-and-schooling...

Why ‘Boys Will Be Boys’ Is an Excuse for Bad Behavior - The time for a culture of accountability is now [..] It validates male entitlement, often excusing discriminatory and even criminal actions against girls and women. - [See many examples of criminal defense attorneys using "boys will be boys" to defend rapists? Part of the fiction these movements want us to believe is that, despite the scarlet mark that sex offenders carry, and the near-universal disdain society shows them, actually, sexual assault is tolerated and excused by our deeply misogynist society.] https://www.inhersight.com/blog/diversity/boys-will-be-boys