I found the thread you refer to, vegansrock and it does not appear to be in the slightest xenophobic; rather it is a series of posts at the start of this pandemic, all wondering why cases in Italy were so high.
Suggestions were that Italian families care for their elderly and live in multi-generational households, that they tend to be more enthusiastic in their greetings etc.
Before we, or even scientists knew much about this virus, there were many theories as to how it spread and these were just suggestions based on fact.
The posts were not horrible, not xenophobic and were made by posters on all sides of the political spectrum.
It was just musing and speculation.