Not wanting my fiancè to go out the country

My fiancè is extremely close to his brother. His brother is a tiktok "beauty influencer" and just invited by a brand to be flown out to Dubai for a brand trip. He's never been on one before and gets a plus 1 so he asked my fiancè and my fiancè said yes. I don't want him to go because while yes a lot more men do makeup nowadays, be honest, which gender is this trip mostly going to have? My fiancè thinks I'm being ridiculous and said he is fine with me going on girls trips. The difference is I'm not being surrounded by a bunch of hot guys. He's pretty much made up his mind that he's going to support his brother and that this is a big milestone for his brother. Am I overreacting?