however if people don't want to support a collective bargaining process than they should be prepared to negotiate their own terms and conditions and not just accept what others have given their time and efforts to achieving.
Yes. Yes they should.
Now what does that have to do with how we, as supporters of the collective bargaining process, conduct ourselves in their presence?
Joining the pack and ostricising people who are thinking differently to us doesn't help the situation, it does make us look bad.
The only possible reasons I can see for that sort of behaviour are
1/ An attempt to bully them onside.
2/ An attempt to make yourself feel better by directing frustration and anger at someone in the absence of a management representative.