The condescending tone is uncalled for. As for the advice, I don't really need to travel as I've lived in Poland for my whole life (minus a few years spent abroad / in the UK). I've also been to several countries in the region, and yes I have indeed brought quite a few "foreign looking" friends with me, including an Italian girlfriend.
I'm sorry if something unpleasant happened to you on such a trip - assuming you're speaking from first-hand experience, rather than just propagating negative stereotypes - but it still wouldn't entitle such sweeping generalizations.