The problem is, we as humans can only understand things through the vantage point of our own limited experiences.
Whenever someone describes something to us, we're always mentally comparing it to things that we ourselves have gone through in order to understand it and empathize with it.
Cis people do not experience dysphoria. Therefore they're always trying to compare it to things that they have felt.
So, well, it's no wonder that we're so often criticized by cis-men for being deviant sexual fetishists, because that's their experience with feminine things, is being sexually attracted to them. It's why women criticize trans men for just trying to transition in order to gain male privilege, because they have likely experienced frustration with being female due to social problems, so they're assuming it's the same. These people have no reference point. They have never felt the feeling that their own body was wrong, or that their social role was wrong. They're trying to filter these things through their own experiences with the opposite sex.
I know I did the same thing when I first hit puberty. I actually thought that I was heterosexual, because, well, other guys liked looking at girls too. So I assumed that all guys were doing the same thing as me, looking at women and imagining that they were them. I thought that this was what made heterosexual relationships, was men wondering what it was like to be women, and women wondering what it was like to be men, and that's why they were so fascinated with each-other. I was completely shocked when I learned that other people really weren't doing that, they were just looking at the opposite sex and imagining having sex with them, or simply just turned on by the view.
Again... it's all trying to understand other's emotions based on only your own limited experiences.