the r/btc subreddit bangs on and on like this all day
only about 10k subs on there, compared to about 170k on r/Bitcoin though...
looks like they're doing some overtime here
Can someone explain the difference between the atmosphere at Reddit vs BitcoinTalk. Are you suggesting that r/Bitcoin is slanted to Classic and Bitcointalk is Core? There is a process to learning all of this

No. Both are run by Theymos who is a core fan. For some reason much more open discussion is permitted here than on reddit. Dunno why.
Anyone can start a new sub on reddit so more toys are thrown out of prams there.