I'm fully aware of Slovak history, have been there, and my father's parents were Slovak.
The Yugoslav civil wars and atrocities were caused by morons who decided it was a swell idea to retaliate for bad stuff that happened 50-100 years ago against the grandchildren of the people that perpetrated it, and the violence was excused by that fact.
Fortunately, unlike in Yugoslavia, the Slovak-Czech "Velvet Divorce" was entirely peaceful and I do not think there is any prospect of real violence between Slovakia and Hungary.