I've recently been listening to Radio 4 and Radio 4 Extra and I'm astounded by just how much anti-foreigner language there is. 'frogs' is only one example.
The Americans glibly talk about 'towel-heads' and wonder why Middle Eastern people don't like it.
And I'm sorry to say this and racism has become a very popular subject for stand-up comedians.
But if you listen, it's an excuse to curry favour (if you'll excuse the expression) with an audience of like-minded people.
If you are, for instance English and you poke fun at English characteristics, it's often (but not always) funny but the same script delivered by a non-English person would be
racist.
That's the definition of racism: to blame an individual or group's perceived shortcomings on racial heritage.