The 'RHONY' star absolutely shredded Meghan Sunday just hours before her tell-all interview with Oprah was set to air on CBS ... invoking Justin Timberlake in telling her to take her woe-is-me moment and basically shove it.

Bethenny writes, "Cry me a river...the plight of being a game show host, fairly unknown actress, to suffering in a palace, w tiaras & 7 figure weddings for TWO WHOLE YEARS to being a household name w @Oprah on speed dial, fetching 7 m for interviews, hundreds of millions in media deals. Thinking face #MARRY"

On Saturday, Bethenny aired out even more of her grievances over the coverage the interview was getting ... saying, "Not since @MonicaLewinsky interview, have people been obsessed with a young female interview like this #MARRY interview. Remember the famous lip gloss?"

Someone replied to her with a collage of headlines past about how her staff had reportedly been catty towards her right out the gate ... and that's what set Bethenny off anew.

She continued with her tirade, going on to say she gives Harry a break here -- as she doesn't feel he's the one pulling the strings for all this press the couple is now receiving ... something he's repeatedly said he's not a big fan of in light of what happened to his mother, Diana.

BF ended her thoughts with one last apparent shot at Meghan, writing ... "I chose reality tv, to work towards making $, to be scrutinized & criticized. I took the trappings & the beatings along with it. It’s a rose w petals & thorns. People beg to enter the often toxic institution I signed up for. That WAS the life I chose. You can’t play stupid & smart."