Looking at the placement of citations in the Wikipedia article (which as usual is a guessing game because Wikipedia is almost never referenced remotely well), that line comes from this source, dating back to 1929 by a Luigi Vittorio Bertarelli. It's a travel guide to Italy and its surrounds, written for an Italian audience. While the Italians probably know a great deal about their own history, I'd need a copy of the travel guide to cite his source for that. I daresay, it being a travel guide, there is no good source, and besides the guide itself dates back to 1929, using source material for such claims that are even older. Another Wikipedia article on the matter cites similar claims, from a seemingly newer source: The Roman World by Chapot Victor, 2004, pp.140-50. However, this is a reprint of a book from 1928. As we can see, these are atrociously sourced claims.

That said, there is probably some truth to this. Corsica et Sardinia remained a Roman province (that is, foreign territory rather than 'Roman') even into the Empire (Patterson 606). The Sardinians (and probably the Corsicans) too were considered to be even worse than the treacherous Phoencians, as they had been "rejected by the Phoenicians themselves and abandoned on that disagreeable island" (Gruen 460). The Romans did a fair bit of fighting in Corsica and Sardinia, and true to form were not pleasant about it, killing 80,000 people c. 173 BC, even after taking control of the place in 227 BC (Dillon and Garland 279, 288). Gaius Gracchus accused Roman officials there of being corrupt, squeezing the province for personal gain (428: however this behaviour is not unusual in any province in the Republic). Therefore, from what I've read on the matter I'd have to say that, despite that claim on Wikipedia being poorly sourced, it's probably a broadly accurate reflection of Roman views on Sardinia et Corsica and its inhabitants, at least in the Mid Republic when it was one of their only foreign territories. As Roman territory expanded, Rome had many more 'barbarian' lands to control and people that caused them a lot more trouble. That said, Rome always had a problem with 'Easterners', and Phoenicians being the first Easterners the Romans ever had a problem with (the most famous Phoenicians of all being Carthage of course), they may easily have retained a dislike of the inhabitants of those islands.

Sources:

Gruen from A Companion to the Roman Republic, Eds. N. Rosenstein and R. Morstein-Marx, 459-477.

Dillon and Garland, Ancient Rome (a sourcebook), 2005.

Patterson from A Companion to the Roman Republic, Eds. N. Rosenstein and R. Morstein-Marx, 606-624.