Does perspective to someone else break first precept?
It certainly doesn't break the Vinaya rule against killing (which says it doesn't count as &quot;killing&quot; unless somebody dies, plus other conditions).
I expect your uncle is right to say that he should avoid being rude; and even talking about politics at all could be considered questionable behaviour.
I haven't seen any hint, though, that the first precept isn't meant to be taken iterally; for example:

pāṇātipātā veramaṇī：'abstaining from the killing of living beings'，is the first of the 5 moral rules binding upon all Buddhists
(Buddhist Dictionary by Nyanatiloka Mahathera)

If the behaviour is wrong I don't think it's because it breaks the first precept -- instead I think it would be because it's not Right Speech, or something like that (e.g. not friendly).