My thoughts exactly! But I guess the plot protects him.
There are probably thousands of people with the same hair color so its not a big give away
It is if the person he's impersonating doesn't have the same hair color and isn't prone to wearing a hat.
As the players ought to have clothing options, there bound to be a lot of people who choose white hair on their avatar. So I think Han Xiao mixes just fine.
Only because the manhua wants to make him easily identifiable
Maybe his mask is just invisible to us readers ╮(￣▽￣)╭
He uses a face changing mask but umm the white hair should give him away lol