If you mean after NilaRaditz arrived, no. They wouldn't reject him being an alien, even if he was weaker. They have weaker friends, like Oolong, Chazou and Yamcha. Obviously if he was very normal, he wouldn't know them all so well or if he was only as strong as Yamcha they'd all be killed by King Piccolo (maybe not Tien/Chazou, as they may've not become part of the group). There's zero indication they even care that he's an alien. They don't bring it up, except for when it's relevant to battle power. Look how affected they were by Goku's death, even before they knew Nappa and Vegeta would be on the way - it's beyond the care for someone considered an outsider.