I am with you @herehearher it's tiresome isn't? Also, in the vast majority of cases, it's not true. Less than 4% of people in the UK earn a yearly 'six figure salary' and yet the majority of them seem to be on mumsnet - a LOT. Makes me wonder what jobs they do to get this salary, that involves very little work. (That must be the case as they are on here so much!!!) 
They're usually the same ones who cook from scratch, don't have a TV, and who have 'travelled extensively' and of course, they have the obligatory 2 university degrees (in addition to a 'masters,') from red brick universities. Tedious and predictable. And yeah, they DO act like they're superior ...
@5128gap
Everyone knows they exist, but given only 1% have them and the percentage for women is even lower, it does stretch credulity that such a disproportionate number seem to want to post on MN about it.
I take it in much the same vein as the other MN clichés 'DD15 is tall blonde and beautiful' 'DS is 6' 2" Oxbridge and athletic' and 'I'm 60 but everyone thinks I'm 28'.
LOL this!!! ^ Pretty much what I was saying. It's always the same types. And as you say, whilst I know some people in real life do earn £100K +, the vast majority of mumsnetters claiming they do, absolutely do NOT. In fact, they probably don't even have a job. The 'my husband is an extremely high earner, he pays £9,000 a month tax, and I earn less but still pay £7,000 a month tax' type comments are hilarious. Surely these posters must know (on some level) that people don't believe them! 😂
And to the 'haha lol you sound jealous' posters, most people (myself included) are not jealous of people fantasy lives (and fantasy salaries) ta. 