'Utopia' simply means 'no/not place.' I find it relevant to find out if my interlocutor means:
1. Cannot/Couldn't be a place, ever
2. Shouldn't be a place, ever
3. Simply a non-place as of now.
In brief, the first presumes far too much about eternal possibility and your imagination and desires; aka, omniscience and omnipresence.
The second seems a pompous bit of moralism (a projection of their imagination and desires posing as 'objectivity') and not much else; meta-morality on top of omniscience and omnipresence.
The third is so open ended as to include the utopia of that avocado-on-sourdough sandwich still two hours away (or the one I ate yesterday) while my mouth waters now; aka pettiness.
All in all, it seems best to ask them what they mean by 'utopian.'