Yes. One can be against blacks, for example, but love LGBTQIA+ folks.
LGBTQIA+ individuals are not a race. They are a sexual orientation or a gender orientation. One who is against them, is a sexist.
A racist in it’s literal definition, is someone who is against another race of creatures. All humans fall under one race. The term came about when Africans were seen as lesser than human – a different race of creatures.
The correct term, is technically ethnocentrism, which looks at it from a different perspective. While racist means someone who hates other races of creatures, ethnocentrism is holding an ethnicity (usually one’s own) above all the others.
The semantics are not really important, I know, but they’re still interesting.