Hi Tony, welcome to the forum.
The only pity is we disn't meet in better circumstances.
I was diagnosed with T1 as a teenager so I completely understand your T1 friends attitude to it. My attitude was much the same, that diabetes was probably with me for life so I wouldn't worry much about it at until I had to. There would be time in later life to straighten up and fly right.
So the recreational substances and late nights were part of my life at University and I did exactly as my friends did. I didn't even tell anyone that I had diabetes, although they worked that one out for themselves the first time of many when they took me to A&E.
Anyway, I survived, just, and somehow have escaped any lasting consequences. Others haven't been so lucky and find that complications down the line seriously affect their lives.
The problem when I was diagnosed was that there was no internet forum, blood glucose meters, basal/bolus regimes, or most of the stuff we now take for granted. No support and advice like you'll find here. So I reckon you now have the tools to party with your friends, but keep a close eye on how your diabetes is doing at the same time. Smart lunacy.
Good luck, and keep in touch.
fergus