I don't think they're put off by him being EUropean as much as they're put off by him being a 19 year old European who won't be able to contribute for another 3,4,5, years.
Even when a team is "re-building", there is a delicate balance between the future and the now and this pick was only made with the future in mind. If you have character players on your team, they shouldn't be happy about a pick like that.
They'll get over it when Casey has them start out hot out of the gates. The rest is up to JV.