When a girl says, "I'm not into guys who like guys," it means that she is not interested in dating or being romantically involved with a man who is attracted to or interested in other men, i.e., someone who is gay or bisexual.
This statement suggests that the girl may have a preference for dating heterosexual men, or she might have personal reasons for not being comfortable with the idea of dating someone who is attracted to the same gender. It is essential to respect her preferences and boundaries, just as it is important to respect the preferences and boundaries of others in any relationship context. Everyone has their own unique dating preferences, and it's crucial to acknowledge and accept those differences without judgment.