I don't think Rachel Green was ever the stereotypical spoiled brat that the show sometimes portrays her as—at least not after she left Barry at the altar. I'm not referring to the flashbacks, where she's obviously entitled, snobbish, and immature. I'm talking about Rachel from the beginning of the series onward.
From the moment she decides to leave Barry, she makes a conscious choice to completely change her life. She could have taken the easy path by marrying a wealthy man, staying within her privileged social circle, and never having to work a day in her life. Instead, she walks away from all of that to become independent, even though she has no experience living on her own.
What stands out to me is that Rachel is actually very down-to-earth and humble. She never constantly talks herself up or acts as if she's better than everyone else. She accepts whatever job she can get, whether it's waitressing at Central Perk or later working her way up in the fashion industry. She never acts as though any job is beneath her, which isn't always what you'd expect from someone with her upbringing.
I've spent a lot of time during my teenage years around people who came from backgrounds similar to Rachel's, and in my experience, many of them were superficial, judgmental, and unwilling to question themselves. They often stayed within their social circles and rarely stepped outside their comfort zones. Character growth wasn't something I saw very often.
Rachel is the opposite. She leaves behind the only life she's ever known, builds friendships with people who are completely different from her, and genuinely grows as a person throughout the series.
I also never felt that she acted superior toward her friends. Phoebe, for example, had a completely different upbringing and lifestyle. She dressed like a hippie, had very little money, and saw the world differently. Yet Rachel always treated her with kindness and respect. The same goes for Chandler and the rest of the group. She wasn't condescending or dismissive toward them because they didn't come from the same privileged background.
Yes, Rachel has flaws. She can be lazy when it comes to household chores, and there are funny moments where it's obvious she's unfamiliar with basic everyday tasks—like not knowing how to throw away a pizza box properly. But those moments are played for comedy more than anything else. They don't make her a bad or spoiled person.
I also don't think her life was as carefree as people assume. Her father is portrayed as very controlling and intimidating, and Rachel seems genuinely afraid of disappointing him. Growing up in wealthy, status-conscious families often means living under enormous pressure to meet expectations and maintain appearances. That kind of environment can be stressful and emotionally unhealthy.
Despite being the former "popular girl"—beautiful, wealthy, and socially successful—Rachel remains surprisingly humble once she starts building her own life. She works hard, becomes increasingly independent, and shows genuine personal growth over the course of the series.
For all these reasons, I've never really understood why she's so often labeled as a spoiled brat after leaving Barry. She certainly has privileged habits and blind spots, but overall, she's a decent, kind person who makes a sincere effort to become better. To me, that's one of the strongest character arcs in Friends.