I have a DD, a DS and nephews. I do worry that there is overexposure to really unpleasant ideas and videos online and the influence that must have on young minds, when there is nothing healthy to balance it out.
For me, it's a lot of things:
parents and teachers having a consistent, clear message and actively teaching about consent, respect, bullying, self-esteem.
Restricting access to 15, 18 and X-rated material (most boys in Y6 seem to watch violent 15 rated movies, the girls are typically only just watching 12 movies).
Good security and strong, appropriate filters on phones and iPads and other internet-enabled devices.
Bringing children up to expect their online habits to be monitored and restricted to age-appropriate apps and content.
Taking it very seriously and promptly escalating when a child reports any kind of sexual harassment. Making boys aware that any involvement as a bystander or an instigator or a consumer of any unpleasant behaviour makes them equally guilty. Whether it is upskirting, sexual comments, hassling girls to provide explicit photos, mocking boys who don't want to get involved, sharing inappropriate videos and photos, using explicit language, the list goes on and on. I don't think it should be taboo - it needs to be discussed early and often.
To counter toxic masculinity there needs to be an alternative - so bringing up boys to know what a healthy relationship looks like is really important.
There will always be vicious, freakish criminal behaviour but this cannot become the norm that girls and boys simply expect and don't complain about.