Most of central and all of eastern Europe is hostile to LGBT. Poland,
Hungary, Russia, Ukraine, Bulgaria, Serbia etc. Czech is actually
better than some.
Also, I think Hungary and perhaps Austria aren't very different from
Poland in their social and political conservatism. In fact, Hungary
may be worse.
I always speak out against anecdotal information having much value. So take this as just one person's observation and do a lot more research if you are at all concerned.
I was in Budapest a few weeks ago, having a glass of wine at a sidewalk table at my favorite wine bar. Over about a two hour period the gay couple sitting next to me got the same service as I did and not once did I see anyone give them a disrespectful look. Over the years I cant say I have seen more than a few openly gay couples in Budapest, but I can say I have never seen them get any more attention than what they wanted.
Here is this year's gay pride parade: https://www.youtube.com/watch?v=Gx2Rr1hD6Lo
But so you dont think its all roses, this one shows some of the less than pleased people who turned out. The police did their job very well: https://www.youtube.com/watch?v=XS1bWZ-M260
Austria, Hungary, Slovakia, and some others I would imagine, do have a fairly strong extremest segment that makes up as much as 15% of the population. But they are also countries with very low crime rates which seems to translate into; I dont like it but I cant do anything about it.
I would enter a town or a city and spend a little time observing the norm of public behavior between significant others, then comport to that norm; or a tiny bit more conservative.