Tough call as to whether he should have approached you. If you were read by him, he may have just been trying to provide information. I would suspect he was also a cross dresser, and, knew how difficult it was to find a man of a similar mind set. I think the perception of him being rude is not justified. It seems since there is always some self doubt in the vast majority of cross dressers, the vast majority may not want to be approached. Years ago (no decades ago) my wife told me it was OK for me to seek out and attend a support group. I called the telephone "hot line" of a group in Seattle. I was treated so rude and disrespectful that the only thing I could think of was these people better never volunteer for a suicide hot line.
Would I approach another cross dresser? I don't go out en femme because I'm zero percent passable. Should I go up to a tastefully attired and very presentable and passable cross dresser and ask if s/he knows of a support group? Nope, too much baggage in most of us.
When I am wearing a baseball cap with my military unit patch on it, you bet I approach them and strike up a conversation. I view that military patch as an advertisement to stop and talk" what unit, when served, welcome home, etc. Should I run up and ask a woman where she bought her pretty dress because I would want one for myself?
Frankly, we are never able to ascertain a person's zone of personal space. It's tough to make a judgement.
Hey, if my lovely wife did not take the initiative and swim up to me in a public pool forty plus years ago, I would never had married her shortly thereafter.