Wow.

That was pretty terrible of UA all the way around. Is this all it takes, for someone to accuse another pax of behaving "strangely" even if all that means is speaking in a foreign language?!?

I'm angry for you!!

I do applaud you for keeping your cool, though. ^

About your question, while I'm sure others who know more will chime in, I'll bet the pilot has the discretion to ask pretty much anyone to leave his/her plane. I can't imagine it's simply an issue of other pax asking that it be done, though.

Seriously, they should be showering you with SWUs...