This just happened to me in one of my classes.
We got a group project for about 5-6 people, and i sat next to and introduced myself to a mature aged student who looked very serious about getting this done well. Chatted, found out he's done heaps of other study, and has great work ethic! Score! We decided to pair up for the group, and to find some others.
"Oh, i've someone else already, so we have no have 3"
"Ok, cool, who?"
"Her" Points at FOB student - Who i have talked to, and can not, for the life of her, speak english. The most understandable sentence i got was in reference to a Irish lec we have; "He got funny voice".
Sigh. This back-fired.
Later on, when we we're adding others, i said to him [in private], "Mate, just warning you, i am seriously concerned with her ability to do the work..."
He went on some blabble about discrimination, etc, etc. Riiiiiiiiiight.
Since when is it 'illegal' to discriminate on language and/or capacity to work?