P.S. Just the word "oversensitive" alone should give you guys pause. Who determines what is an acceptable level of sensitivity? Are we really going to deny that a lot of guys act like dicks, or do something shady and then when the girl reacts to it they shut them down, not because the chick is wrong but simply because they don't want to actually have to consider their own behaviour or just "don't want to hear it?" Sure, a lot of the time they are being "crazy" and making a mountain out of a molehill, but let's not lose sight of the fact that a lot of people out there are horribly self involved and don't give a shit about other people especially if it inconveniences them to do so. That shit exists and I have even faced it as a male.
An example: person insults the other. Other person gets hurt and mentions it. First person says "I was just kidding, jesus. You're too sensitive!" Too? As determined by who? I see absolutely no pausing to consider the other person's feelings there, and that's because people are a) apt to assume everyone is wired just like they are and b) don't want to have to admit fault or actually consider their behaviour.
When it comes to this "acting crazy" thing, is that if you ask first, and their response is pretty well, crazy, then okay. Bitches be crazy. A lot of guys though, they don't even ASK. Just immediately write it off. "Oh, you're crazy, relax!" The author is just saying, "hey, why not investigate a little before writing them off? Sometimes you're writing off legitimate feelings." And btw, when guys do that, guess what that leads to over time? More "acting crazy" which they further chalk up to the chick being "nuts" and don't ever stop for a minute to consider their part. I can't understand how anyone can deny that this happens. It's super common, and not even just with guys/girls and romantic relationships. ALL relationships (friends, family, etc) are fertile ground for this. I myself have had this happen numerous times over my life. A lot of it because of my own parents and their abuse. Or friends in the past, being total dicks. I tell them how I feel about what they did/do and I'm just "too sensitive" or "making a big deal out of nothing." Not one second to consider their (shitty) actions or how I could be affected. Just quickly write you off and move on.