I never have a problem with Crewing or Ops that makes it negative. I am polite and understanding 100%. I willingly do jobs required of me and only protest if I really really need to get out of it. I get the same back on the whole. Ok some new crewing people won't know me well, but I find the odd cheeky help from crewing makes me smile for days on end. Can't see this happening in a big outfit.
It takes two to Tango and it does seem that quite often it is not what crew say to crewing, but how they say it that will work wonders on kindness.