I think it is inappropriate to say anyone is 'talentless or riffraff' and especially not immature, because the immature comment seemed almost like calling the kettle back by the way it was said.
There might be new players who are not as experienced as the older ones, but it is unfair to say they're the reason that some players have a clique-like mentality or simply opt not to RP with somebody else. Chalk it up to it being their loss and find somebody else who recognizes and accept your characters.
Drawing attention to yourself by saying 'Play with me. I am better then them' isn't going to garnish you any positive opinions, instead it makes one look cocky and less inviting to role-play with.
If someone is ignoring you, ask them why. If they don't answer, move onto the next available person to role-play with.