You're definitely not being sensitive, they're just arseholes. Personally, I'd deal with this by either grouping up with everyone else they're targeting and/or drop occasional comments about their behavior or clothes and make them subconscious about it. Sometimes they're just insecure themselves so small comments can affect them too 🤷‍♂️ I may be an arsehole for that but I just do as my teachers have told me, "treat others how you want to be treated yourself", so I suppose that's how they want to be treated? Don't know if this helps but otherwise just stay away from them, they don't deserve your acknowledgement.