Either that or some Lithuanians are just not very nice people.
I don't think it's specific to Lithuania, many people from many countries are fucken assholes; the good thing is that you can move on from while they are stuck within themselves and have to deal with being an asshole. Often people that say the things you mention above do so out of spite and seek a feeling of empowerment which they mistakenly feel comes through dragging someone down. It's often because they have poor self esteem. What they don't realise is that lifting one's own self esteem is usually as simple as working towards lifting someone else's.
So I say...fuck them.