Consider this; you're going to Eastern Europe, as you mention in another comment.
In Eastern Europe, like in the rest of the EU (including the UK) there are people living in a bit of a recession (some might say quite a big depression).
Like many in the UK, their thoughts are for their families, friends, how to pay their bills, and how to have fun. They enjoy their weekends, just like you. And for the most part, they enjoy meeting new people, just like (presumably, since you're travelling) you.
For the most part, people everywhere are just that, people. Good people. Most are happy to meet people coming to their country - after all, you're bringing in tourism money. You're spending in their stores, staying in their hotels, buying their food. All positive.
And what of those who aren't all buzzy and happy about a foreigner? Mostly, like in the UK, you'll just find them apathetic.
Then finally, you have the minority - the few bad apples. They exist in every country, and if you're unlucky, you may run into them. You might even upset them. They might even do something bad to you - verbal abuse, robbery, or worse.
This could happen in Eastern Europe, it could happen in London, or it could happen anywhere - and if it does, you're unlucky.
But for the most part, unless you're in a war zone, people are good people, and living their lives just like you, and you'll have a great time, fantastic experiences and want to do and see more.
Of course, there are some things you can do. If you're doing well financially, don't rub it in. Don't insult their culture, food, land or anything like that. Remember they have history, especially ex-Soviet states can be sensitive about their past. Don't get too intoxicated and make a fool of yourself. Funnily enough - all rules that apply back at home too.
Above all - have fun, Eastern Europe is fantastic!