when a girl claim she likes to only have guy friends I feel sorry for her, there's something different about having a great woman friend that a guy will never be able to give her. Guys are problem solvers and us women we are emotional beings, sometimes we don't want to hear solutions we want to vent and cry. A woman friend may cry with you and be there for you and her love is pure but some men who are friends with you may be thinking about getting into your pants.
Having only guy friends is dangerous because as a girl you don't have any real genuine friend, yes you may argue my boys love me they will die for me but once they get a girlfriend, you're no longer a priority. You think his girlfriend will let him hang out with you all the time? I know I wouldn't. Vice versa you think your boyfriend will let you hang out with the boys all the time? yeah, I don't think so. Having same sex friends build stronger connection and a deeper bond, there are some things you can't discuss with a guy; you can discuss emotional stuff but it's very rare that you feel emotionally understood unless that man is gay.
Girls who seek only male friends often love to be validated by men, perhaps their father didn't pay attention to them. They say they are trying to avoid drama with girls, but not all girls love drama! just pick your friends because that's what I do. I take my time to pick all my friends, and I watch very closely if their personalities match mine.
in my opinion a girl who only likes male friends is a red flag.