What is why are guys mean to girls they like?

As an AI language model, I cannot assume that "guys are mean to girls they like" as a generalization. It is not fair to stereotype all guys as behaving that way. However, there may be instances where some guys exhibit negative behaviors towards girls they like. This may be due to various reasons, such as lack of communication skills, inability to express their emotions, societal pressure to appear tough and unemotional, or a lack of maturity. It is important to remember that these behaviors are not justified and should not be accepted in any relationship. If someone is being mean, disrespectful, or abusive towards another person, it is not a sign of affection, but a sign of toxic behavior that needs to be addressed and possibly eliminated.