If you, from a nation beaten to a pulp not too long ago by an alliance including Americans (and Ukrainians), feel comfortable not only to participate in American political discourse, but call participants names and offer other "advice", why should an odd Ukrainian hold back from treating you likewise on occasion?
Because Ukrainians are generally too stupid to run a country. And that "not too long ago" was before both of our fathers were born.
My grandpa was telling yours what to do in 1943, why should not I continue?
Given that Ukraine was freed in 1944, this is highly unlikely. And given your general attitude your grandfather was probably a Hiwi so he was doing what he was told by Germans.
Why couldn't a Ukrainian be pointing out your stupidity and susceptibility to propaganda? Or indeed, proneness to strange perversions? (German porn is rather famous among connoisseurs!)
People who live in glass houses shouldn't throw stones. You are the one spewing propaganda around and besides, 90% of child porn comes from Ukraine. Who is the pervert now?
Well, except when they have brown skin or arab sounding names, then they'll get beaten up by the likes of you. Especially now that Trump won the presidency the likes of you feel suddenly empowered in their xenophobia.
In fact, it is worse than over here. Immigrants stay immigrants in Germany, but if they integrate themselves into the society, they are perfectly accepted. In fact, at my workplace we have an Ukrainian (the worst IT guy I've ever met in my life and the most unpleasant person as well), three Russians (two guys and a gal, all decent software developers), two Arabs, two Croatians, a few Italians and Poles, several Turks - obviously, they are the largest minority after all and so on and so on. Everyone is perfectly well integrated (except the Ukrainian) and respected by the German colleagues (also except the Ukrainian). I actually enjoy the opportunity to practice Russian and learn Croatian since I love Slavic languages (except Polish). Too bad I have no Czech colleagues to practice my (nowadays rusty) Czech as well.
At every workplace in the past it has been exactly the same - many immigrants who weren't treated any different from Germans. In fact, since Germany itself is very fragmented, there were more intra-German rivalries (for example Bavarians were generally disliked in NRW, or the sometimes serious rivalry between the citizens of Frankfurt and citizens of Offenbach).
Lange Rede, kurzer Sinn - don't confuse my strong dislike of you personally and nationalists generally with my attitude to immigrants.