Explicit GamerTags

I played a bit of Revenge last night and as none of my friends list were on Revenge I was joining random rooms.I was kinda annoyed by the amount of people with sexually explicit gamertags, so much so that I wanted to file complaints and force people to change their tags to something more appropriate. But its kinda hard to do that on Revenge now, I tried just jumping into a room and jumping out again hoping to see the members of the room on my recent player list. But no, you have to have completed a race with people before they appear on your list. So then I tried joining and selecting a gamercard hoping I could file the complaint before the race was started. But NO the dude started the race with just me in the room. Luckily I had been racing already so had my Revenge Racer preselected (although my first round of races of the day was in the Alienware as I was sending a message when the game was launched!). So, I almost won all 3 rounds then tried to jump quickly but he started the same tracks again before I could blink. This time I did win all 3 rounds and told him not to start it again as it was getting late and I wanted to stop playing. He then closed the room down.  But what a kerfuffle! Why did they change the recent player list? If I jump in a room and someone is being disruptive or has an offensive tag I want to be able to file a complaint without having to race against them!

How hard is it to come up with a cool appropriate gamertag?