one question

Dear Teacher,

I have difficulty understanding the last sentence. Would you please do me a favor?

It seems WE give and THEY take. This does nothing for racial harmony. It just makes Muslims look mean-minded - which the vase majority are not.
This country is very easy-going and accepting of its new citizens.
[But pigs will fly before we put up with this kind of nonsense. ]

Thanks a log.

[Tdol]

It means we will never tolerate this nonsense. 'When pigs fly' is an idiom for something we think will never happen.