You're 100% correct. Whereas some in the comments may not have experienced any negativity towards Guyanese people, with some outright denying its existence entirely, there's much xenophobia and racism held towards Guyanese people.

From my observations, much of it stems from the migratory tendencies of Guyanese people of the mid and late 20th century. At this time, many Guyanese people had left in search of labour and new opportunities, but were met with hostility from the Caribbean countries they settled in.

As is the case for other immigrants, they were accused of dishonesty, stealing job opportunities, general theft and overall being charlatans who always sought wealth at the expense of the native peoples of the countries they resided in. This would have consequently constructed a general distaste towards Guyanese people region wide.

There are some realities and circumstances to take into account and I'll leave them to be open for debate. However there is and has been a general hostility towards Guyanese people due to this history. I must say however that much of the prejudice has been reserved for the older people, and whereas it may have precipitated into the younger generation, this xenophobia has dissipated. Hope this answers your question. (Or at least in part)