Well this is a very interesting topic I must say, as I am currently in the "Bear" category. I've been on the other side too so I have some perspective.
Okay. As a bear (which I realy don't identify with, I just happen to be heavier and furry), I get rejection all across the board. From the Bears, the Mainstream homos, and the chasers. I personally am not much into a guy who is bigger then I am in size but in height I have no issue and as for fur don't mind it on the body but facial hair is a hit or miss thing with me.
As for the other sub groups that I have had the pleasure of knowing on occasion, the Leather folks tend to be the friendliest at least in my opinion. I am not a leather person, I love the look on the right guy but I don't live the lifestyle in the least. But in meeting a friend I had chatted with for a long time back on AOL I drove to MA to meet him and attend a function for a group he belonged too. I was welcomed with open arms by everyone in the club and not just my friend.
Personally I think this is due to the Leather group being shunned because of their sexual interestes, some guys can get into some odd things and lets face it, if you've read a real leather man's profile anywhere you know, they can be a bit wild in the bedroom. Not that I am judging to each his own I say.
The twinks, I can't comment on as i was never ever a twink in the slightest, I always had fur and I was never very thin, my smallest waist was a 32 and that some say was to small for me. Thats another story.
Now, in my 20's I was bald, I started loosing my hair at 16 and was totaly bald on top at around 21 or so, give or take. I would tell guys my age online and they never belived me. The minute I shaved my head and put up new picutures I was suddenly HOT to guys who wouldn't even give me the time of day prior. Go figure.
So, for me, well its difficult to say as I never really felt as though I fit into any of the Gay sub groups or cultures, I was always a bit different and never really intot he "gay" world or the club/bar scen either.
Any way that is my take on this particular subject, do what you will with it.
Breeder, this bear imparticular would never shun you, may seem like it at first as I am shy in person, but I would definitely be into doing all those things you mentioned above. WOOF, GRRR!