If you accept answers for a slightly later era (86-90) :
1) How much did fantasy (IE Dungeons & Dragons) factor into the Heavy Metal subculture in this period?
It wasn’t really a main theme in my time although you could get an occasional mention. Common themes were horror, satanism, nuclear warfare and anything more or less creepy. There were however bands who already specialized in the fantasy aspect, like Helloween.
2) The Hippies had their sandals and kurtas; Disco had platforms and leisure suits…What was the attitude for a guy in the Metal scene circa 1980-1984?
Black jean or leather jacket with band patches, black t-shirt of your favourite band (worn over a black sweater in winter), jeans.
3) What did Iron Maiden/Metallica/Slayer, etc fans think of stuff such as Guns N’ Roses, Bon Jovi, Motley Crue, etc later in the decade?
I loved Guns N’ Roses. Although I identified them as “not metal”, they still earned my respect because of the strength of their first album and the aura of danger that surrounded them. The other bands… not so much. Bon Jovi had a special place because they’re the ones that made me realize that guitars were cool. It was slippery slope from there :D. I had stopped listening to their stuff by the time I moved on to metal, but I couldn’t really bring myself to despise them because they were my “gateway to the real stuff”.
4) Did the scene dry up in the early 90s with Grunge? What were the views on Grunge?
Not that I remember but I was clearly drifting away from it by 1991. Most of my friends were still listening to the same stuff.
For the early-mid 80s Punks here:
1) Was the post 1980 Punk scene less political/socially oriented than the late 70s movement?
I don’t think it was. The Exploited, a second wave punk band that I listened to quite a bit, had political lyrics and the 80s French punk rock scene was very political, too.
2) Was there still a DIY aesthetic to the scene as there had been circa '76?
In spirit, definitely but I think the scene had sort of professionalized, albeit perhaps unwillingly.
3) What did a Punk guy or gal wear to show their Punk pride in the early and mid 80s?
Well, you’ve just mentioned the DIY aesthetic… In my experience, punks were much more open to divergence when it came to clothing. You could absolutely wear a business suit and still be considered a punk if you had the right attitude. Metalheads looked much more alike.
4) What did you guys think of Grunge when it came out? Was it the next step for Punk, or was it just classic rock with new clothes? When did you think of stuff such as Green Day which in the mid 90s was called the rebirth of Punk?
I wasn’t impressed with Smells like Teen Spirit the first time I heard it, especially since the DJ had hyped it for what seems like minutes before playing it. I liked it better the second time around and I ultimately became a moderate Nirvana fan. I was not keen on the other bands that appeared at the time like Pearl Jam. I mean, I thought it was cool that distorted guitars were popular again - I had spent the late 80 seen as a weirdo - but I can’t say that I really ever loved grunge. As I said earlier, I moved on to others things : Cold Wave > 60s and 70s rock > Jazz > Classical.
I listened to both metal and punk rock at the time. Historically, there had been (and still remained) a bit of distrust between the two scenes but by the late 80s, it was acceptable to like both. Bands like D.R.I. had helped cross the divide that may have once existed.