Why did some union members have hostile attitudes towards chinese laborers?

the chinese laborers were poor negotiators.

the chinese laborers did not like unions.

many chinese laborers accepted lower wages.

chinese laborers refused to strike.

Many Chinese laborers accepted lower wages. 

When the Chinese came to America, they were simply looking for a better life and they would take any job that was available to them, even jobs that paid dirt wages. Union members didn't necessarily like the Chinese because they were trying to bargain for higher wages and with the Chinese accepted very low wages, it was hard to do that.