That is a serious point and I would like to give a serious answer.
One of the reasons the OP bothers me so much is that I know a great deal about that history, and about recent challenging and soul-searching. Gymnasts themselves led the way in challenging a prevailing culture where women deferred to male coaches, served their nations, and stepped down as they grew into adults.
If there are two teams that have challenged and disrupted that culture especially, they are Brazil and the USA. These are teams of adults. They are adults who support their fellow gymnasts across national boundaries. They have spoken up against sexism, ab.se, online abuse and bullying. They have asserted their autonomy regarding routines, schedules, sponsorship deals, and yes, fashion.
These were the sparkliest of the teams in show yesterday. They are the people posting on social media about their right to enjoy food. They talk about being proud of their achievements, comfortable with mistakes, supportive of each other's mental health. They design (Brazil) and collaborate (USA) their own leotards. They are proud of their bodies. They work hard on their artistry - for Brazil this is world-beating, and it is work!
They love sparkles. I don't. They have chosen to wear them. I am thrilled for them. If I don't accept some middle aged man getting to undermine their choices and bodily autonomy, why would I do it myself.
They deserve more respect than some of the sneering and body policing on this thread.