Most men are discouraged from engaging in meaningful positive emotional or physical interaction with other men. Perhaps part of the issue is that pleasant but reserved interactions you're having are some of the most positive that they have experienced and they're misinterpreting them as something more meaningful as a result.

Perspective is everything. From my POV it feels as though men take advantage of the generally caring nature of women and feel entitled to a captive audience and a receptacle for a feelings-dump.

"She smiled at me. I'll just go sit in her car and vomit all my negative feelings in her lap and leave with a lighter burden. She'll love it, women live for the opportunity to nurture and help"