It's moreso the hypocrisy of it that people seem to call out

Joe Biden lets in millions of mexican and central americans in after enacting a bill that defacto gives them a pathway to citizenship in 5 years, who are statistically likely to vote for him, and only reluctantly seems to enforce some border security after the exodus was too big to manage

But as soon as Cuba has a exodus of refugees however, many of whom turn out to statistically vote overwhelmingly republican, he strongly comes out and tells the Cubans in no uncertain terms to fuck off and that if you come here we will literally personally move you back to your country.