Hosting own games is a problem, especially when there is a 5v5 at the other room and because he is not known people may not join his game if there is absolute low numbers, and people number is slowly decreasing who plays this game (as I noticed).. And kicking someone from a simple 5v5 is a very lame thing just because some friend arrived, and you waited like half an hour to get finally kicked. Best you can do is indicate how good are you, people don't like players that are so stupid, that they cannot even colonize the asteroid next to them (AND many noobs are like this, I saw it many times), with saying what level AI you have defeated on smaller maps, Unfair AI is a required thing (if nothing else, Hard, just to be sure you can play this game), as a human will be harder opponent in efficiency (if you get a non-noob as opponent), but it can be a good start and host may not kick you this way. People are afraid of noobs that purchased the game 1 day ago and show no respect for the community, they go online and join even skilled games (why the f*ck would anyone do this? they don't even know how to move units properly, I will never understand..), although they don't even know how to beat a Hard AI, or how to colonize the planets next to them instead of upgrading the homeplanet to maximum before moving out, no scouting, no idea of ship counters, brutal starter capital ship choice (sometimes the weakest ones), as these players will be eradicated in 10 minutes without resistance and may give the other team huge advantage from then on.
If you talk to guys there it shouldn't hurt anyone, and you may be accepted better into that game, so they will know better how good are you, and you will not ruin your game.
Many of the above statements are only valid if you know some basic online strategies and not play like a total noob (I assume you are not one).