Yeah this has been my experience too. I did normal on my BLM last night and then went to party finder looking for groups.
A. They were all already demanding you have clears and threatening a kick if you die.
B. Every group was either only accepting four tanks or three tanks and one healer.
If the whistle isn't something you can trade between characters, probably means I'll be stuck trying to gather my own group because the community is already pushing out most classes and its only been 24 hours.