It's not always a good idea to look up "old school mates" names on the net... I just did with one.
I don't know why I did think about him at all, hadn't seen him in 25 years! Now the first thing I found out was that he worked at a bank (no surprise) and the second was an "obituary", apparently he died 2 years ago.
Another thing: yeah I do hope that there is some kind of "karma".
There was this guy from Austria, I exchanged letters with him for years, mostly about bands, exchanging news, sometimes tapes (later cds). But he became more and more unpleasant, his taste seemed to be above everyone else's (especially with movies), he moaned about this and that. When he started to like Trump and other "right-wing" tossers, I cut the ties to him. I refused to accept any more letters (one was sent back). He was never in my FB list, when he found me and commented a pic, I jumped at the chance and blocked him immediately. Now there is one internet forum left where he can contact me via PM. His last one was ridiculous... he is quite a troll.
I hope one day it will be "payback" time for him...