mansplainern.
/ˈmanspleɪnə/, U.S. /ˈmænˌspleɪnər/ colloquial (originally U.S.).
A man who explains something needlessly, overbearingly, or condescendingly, esp. (typically when addressing a woman) in a manner thought to reveal a patronizing or chauvinistic attitude.
ΚΠ
2009 @renward 28 Apr. in twitter.com (O.E.D. Archive) Ugh, mansplainers are the worst. Let me speak in slow, condescending tones so the Women understand because I'm a Nice Guy.
2012 Globe & Mail (Toronto) (Nexis) 22 Sept. r6 Even the most egregious mansplainer does not deserve the path to hell Mamet paves for him.
2016 B. Poland Haters ii. 38 Often a mansplainer has little or no expertise in the area on which he is attempting to appear authoritative.
This is a new entry (OED Third Edition, January 2018; most recently modified version published online March 2022).
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n.2009