Nice Guy syndrome isn’t frustration with women because they won’t have sex with you. Its frustration from rejection. Its confusing being as nice as possible and not being viewed as someone anyone would want to be in a relationship with, while other guys are seemingly terrible human beings and they are doing just fine. Is rejection easy to deal with in any form? No. Does that affect you as a person over time? Probably yes. Does that make you not a nice person? No. I understand what this person was trying to say, but I don’t think think thats the right way to explain yourself. I don’t think the person who wrote this is nice. And also, why can’t I be frustrated? This is a double standard. So when a girl talks about always being the girl who gets ignored and looked over for the cheerleaders and whatnot, I am allowed to say oh by the way you are getting ignored because you are annoying and play the trombone and you should have thought about that before you started high school because now everyone is calling you tromboner so fuck you. See reading this has made me not nice.