AO tech crew
BabyMetroboy,
Being one of the AO cabin crew, I can confirm that AO tech crew are generally very friendly towards FAs. As far as I know, AO's tech crew have to go through a long selection process, especially personality wise, so they are the friendly bunch from QF.
Yes, we do stay in the same hotel, but due to their EBA is different from FA's, they may not finish the whole trip with the same FAs. There may be a change of tech crew due to operating hour restrictions.
It's really up to you if you want to mingle with tech crew or not. But we all work together, no so called "QF attitudes" amongst tech & cabin crew. I quite enjoy going out with them, or sometimes just chill out by myself. Can't get enough of flying.