The term ‘gaslighting’ has a very specific meaning - it’s a form of manipulation in which a person causes another to doubt their perceptions, memories and beliefs by using denial, misdirection, contradiction and disinformation.
But I see it all the time on mumsnet to refer to any number of usually much more benign things - someone disagrees with you about something? Gaslighting. Someone points out that you forgot to do something? Gaslighting. Someone had a difference of opinion about a subject of debate? Gaslighting.
Is it just in vogue at the moment? Or do people think it legitimises their position in a dispute if they can characterise a routine disagreement as someone actually trying to psychologically destroy them?