OMG. How did you come to that?
In Ukraine de-facto works an ethical norm that everybody speaks the language he likes more and gets respond in a language interlocutor likes more. For locals it is not a problem to understand any of them. But if a person with a "far" foreign accent speaks Russian (s)he most probably will be responded in Russian even if interlocutor likes Ukrainian more.
Situation when someone speaks Ukrainian instead of Russian just to make you problems is extreme and rare.
"Surzhik" in fact is a great number of quite different local dialects which are used mainly in rural areas. Plus sometimes a person from an area with mixed language practice can mix words and constructions from languages.
All of the above is quite natural and mostly has nothing to do with "embarrassing" or "brainwashing" of any kind.