There are two major parties in Germany who oppose NATO membership: The far-right AfD and the left to far-left Linke. They have less than 20% of the national vote together. In 2019 there were 54% of Germans in favor of the NATO membership and 13% opposed it. [1]
Can't talk for the other countries, but given that you have no sources other than "I heard someone say that", I'm not inclined to believe it.
[1] https://d25d2506sfb94s.cloudfront.net/r/52/YouGov%20Eurotrac...
From outside the American media bubble, it is quite clear to see which nation is committing the majority of crimes against humanity and war crimes today, and they don't speak Russian. They commit these crimes like cowards, hiding in Arizona strip malls, remotely controlling their death robots and raining hell and fury down on utterly innocent people, every single day. Germans know this and care. Americans either don't know about it, or don't care - or both.
I suggest you ask your relatives how they feel about NATO encroaching further and further towards Russias' borders, and what do they think about the recent NATO exercise that flew armed nuclear missiles within 20km's of Russias borders. If the tables were turned, Americans would be having kittens - but somehow, Russians are supposed to take these threats lightly?
NATO is a defensive alliance. A country can join or leave NATO alliance. Nobody forces a country to join alliance. The higher threat RF creates for others, the more other countries are wanting to join an alliance to get protection from RF threats.
I highly suspect that your colleagues in Slovakia are invented.
NATO is the threat that Russia is responding to by buffering its borders and protecting its nuclear-armed naval base on Crimea. Its not Russia putting American bombs within strike distance - its the USA and its criminal NATO partners.