Someone brought up the point that these guys might not know what trans man means - and I agree, most people's response to that word is "o.O"
Beyond that, it's just an unfortunate reality of the territory, for cis or trans people. Most people don't understand what it means to be transgender, and they don't understand what dysphoria is and how it affects us. For a lot of guys, it's like "oh, you have this part and I have this part, we should be good to go!" You can't control what they do or think, all you can do is block and ignore, and wait for messages from someone you might actually be interested in.