I don't think you have to be Chris Froome to want to wear cool looking gear, if they have the funds then why not? Another thing is just because something looks expensive and has a high suggested retail value doesn't mean it was expensive. I'm not shaped like the average man and can find cycling gear for cheap because of it. 6'4",165 pounds, size 13 feet, and a 61 cm bike frame... The bargain bin regularly has gear 70%+ off. Shorter people and find similar sales and the average joe can simply buy last years model on the cheap.
If someone is dressed like the their in the tour de france and is arrogant or show offy toward you, so what? If you beat them up the hill or out sprint them, they'll be bragging towards themselves. I actually like to see expensive equipment regardless of a cyclist ability for a few reason:
1. Top line bikes are not the sort of thing id entertain buying, but they are a work of art. I like seeing a wide variety of bikes.
2. You realize that a "super" bike isn't some magic pill. The fast guys are fast and the slower guys are slow. It makes you see what you have to do to improve your riding and places new gear very low on the totem pole.
I was on a bike ride with my local club in a different group than I normally ride with. This women asked me "are you on some sort of cycling team?", I said "No why?"..She said "because all your gear matches and you look pro"😉..I laughed hard. I have a $800 used synapse, three jerseys, 2 pairs of mt. bike shorts and 2 pairs of road shorts. Each item cost between 35 and 50 bucks. I don't consider that too much for one of my favorite activities.
This post is a little long winded, but respect should be earned only through action and not by how someone dresses.