Is there a moderator or facilitator at the meetings to keep the focus on track and positive? He or she should be abe to deflect or redirect a negative 'pack mentality'. Perhaps you could speak to him or her about concerns.
But, I agree, don't let anyone steal your shine; it has been hard earned, I am sure. You most likely won't change their behaviors through a confrontation. Continue to be the voice of support, reason and compassion; it may eventually sink in.