Article here. Excerpt:

'The term 'toxic masculinity' has crept into the lexicon in the past 12 months, having appeared in mainstream news articles, popular feminist blogs and, as of November, the crowd-sourced online repository of slang words, Urban Dictionary.

Generally used to denote how some aspects of masculinity — such as entitlement, homophobia and sexual aggressiveness — can harm women and families and cripple men's own health, toxic masculinity, at its most extreme edges, has been linked with acts of violence like mass shootings and university campus sexual assault.

(For this reason, some US colleges have recently introduced 'toxic masculinity' courses, in which male students can reflect on topics like rape culture, machismo and pornography.)
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And at the recent Women's March on Washington, a rally for which hundreds of thousands of demonstrators gathered to express their concern that women's and other minority groups' rights will be eroded under President Trump, many carried placards emblazoned with references to 'toxic masculinity'.

"I came here to march against a toxic masculinity and years of misogyny," Washington DC resident Andrew told TIME of his motivation for marching.
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"The first is emphasising how masculinity is patriarchal — based on entitlement, based on power, based on dominance — and fuels some men's violence and mistreatment of women or indeed other men," said Dr Flood.
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"To say 'toxic masculinity' — it does imply ... that all men are toxic.

"Clearly there is such a thing as toxicity in some of the ways that men are socialised, but to suggest that all masculinity is toxic and that all men are violent is completely wrong."'